Thermal Sensors
OHD Thermal Guard
Overview
Applications
The OHD Thermal Guard is developed for thermal problem
countermeasures and safety standard conformity, which
are becoming increasingly important for electronic devices
in recent years.
Typical applications include atmospheric temperature
detection and overheating monitoring of power transistors,
power modules, room heaters, hot gas heaters, PPCs,
amplifiers, motors, HDDs, FDDs and other general
appliances.
Its unique proprietary design features a magnet and
a temperature-sensing soft ferromagnetic substance
called Thermorite®. The material’s magnetic flux density
decreases as the temperature increases turning it into a
paramagnetic substance at the Curie temperature.
Benefits
• High reliability for on/off operations
• High-speed response
• Long operational life
• Excellent environmental durability
• Compatibility with extremely low (0.1 mW or lower)
signals to high power (6 W) levels
• Extremely simple circuit design
OHD1
• Compact, light and easy to handle
• Dust, explosion and corrosion-proof
• Wide range of operating temperatures available in 5°C
increments from +30°C to +130°C
• UL, CSA and TÜV approved
• RoHS/REACH compliant
OHD3
OHD5R
Built Into Tomorrow
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
1
Thermal Sensors – OHD Thermal Guard
Ordering Information
OHD
1-
50
B
Series
Maximum
Opening/Closing
Power (W)
Operating Temperature
(°C)
Contact
Type
OHD
1 = 6W
3 = 6W
5R = 1W
30 = 30°C
35 = 35°C
40 = 40°C
45 = 45°C
50 = 50°C
55 = 55°C
60 = 60°C
65 = 65°C
70 = 70°C
75 = 75°C
80 = 80°C
85 = 85°C
90 = 90°C
95 = 95°C
100 = 100°C
105 = 105°C
110 = 110°C
115 = 115°C
120 = 120°C
125 = 125°C
130 = 130°C
B = Break
M = Make
(OHD1 and
OHD3 only)
Structures and Principles of Operation
Thermal Reed Switches (TRSTM) are temperature-sensing switches composed of a magnet and a temperaturesensing soft ferromagnetic substance called ThermoriteTM. This material's saturation magnetic flux density
decreases
as the temperature
increases, and itof
turns
into a paramagnetic substance at the Curie temperature.
Structures
and Principles
Operation
Thermal Guard (OHD) are temperature-sensing switches composed of a magnet and a temperature-sensing soft
ferromagnetic substance called Thermorite. This material’s saturation magnetic flux density decreases as the temperature
Temperature sensing ferrite（Thermorite Ⓡ）
increases, and it turns into a paramagnetic substance at its Curie temperature.
◆ Our self-developed Themorite is temperature sensing ferrite utilizing Curie-temperature,
where ferrites lose its magnetic property.
Thermorite
properties
Thermorite
changes
its magnetic property rapidly at Curie-temperature.
of
Thermorite
as temperature
sensing
material.rapidly at its Curie temperature, providing quick response times.
◆ Features
• Thermorite changes
its magnetic
property
(1) Curie-temperature do not vary as time advances, because it depends on compounding ratio.
• The Curie temperature of Thermorite does not vary with time, as it is based on a compounding ratio.
(2) Arbitrary shape available as ceramics.
Thermorite
is stable
againstgas.
moisture and hazardous gas.
(3) • Stable
against moist
or hazardous
Thermal property of Thermorite
Permeability - temperature
TC＝60
TC＝90
Permeability
TC＝120
4000
3000
TC＝150
2000
1000
0
20
40
60
80
100
120
140
160
3500
Saturation magnetic flux density
TC＝30
5000
0
Saturation magnetic flux density ‒ temperature
（1kHz-0.01Oe）
6000
3000
2500
2000
TC＝150
TC＝90
1500
TC＝60
1000
TC＝120
TC＝30
500
0
0
20
40
Temperature
（℃）
60
80
100
120
140
160
Temperature（℃）
TC=Curie temperature
Encasing
Structure of reed switch
◆ Reed switch is contact switch comprised of a pair of
Fe-Ni alloy reeds encased in glass tube
with inactive gas. The reeds are switched on or off
Inactive gas
by magnetic field of permanent magnet or magnet
coil.
◆ Long lifetime, High environmental resistance
because of protected contact by glass encasing.
N
◆ Reeds in glass tube become magnetized with
S
magnetic
field,
and then
two reeds
contact
and
© KEMET
Electronics
Corporation
• One East
Broward
Boulevard
connect
each otherFL(switch
on).• 954-766-2800
And then magnetic
Fort Lauderdale,
33301 USA
• www.kemet.com
field disappears, the reeds separate and disconnect
(switch off).
Glass tube
Contact
Fe-Ni alloy reed
S
N
N
S
SE0202_OHD • 8/10/2023
2
TC＝150
2000
1000
Thermal Sensors – OHD Thermal Guard
0
0
20
40
60
80
100
120
140
160
Saturation magneti
Permeabi
3000
2000
TC＝60
1000
500
0
0
20
40
60
80
100
120
140
160
Temperature（℃）
Structures and PrinciplesTC=Curie
of Operation
cont.
temperature
field disappears, the reeds separate and disconnect
TC＝120
TC＝30
Temperature（℃）
Reed switch structure
• The reed switch is a contact
switch
comprised
Structure
of reed
switch of a pair of Fe-Ni alloy
reeds encased in a glass
tube switch
with inactive
Thecomprised
reeds areofswitched
is contactgas.
switch
a pair of
◆ Reed
reeds encasedmagnet
in glass or
tube
on or off by the magneticFe-Ni
field alloy
of a permanent
magnet coil.
with inactive gas. The reeds are switched on or off
• The reeds in the glass tube
become magnetized from the magnetic
by magnetic field of permanent magnet or magnet
field, allowing the two reeds
coil.to make contact and connect (switch on).
Long lifetime,
resistance
When the magnetic field
the High
reedsenvironmental
separate and disconnect
◆disappears,
because of protected contact by glass encasing.
(switch off).
◆ Reeds in glass tube become magnetized with
• The glass encasement ofmagnetic
the reedsfield,
ensures
high environmental
and then two reeds contact and
resistance and a long operational
life.
connect each other (switch on). And then magnetic
TC＝150
TC＝90
1500
Encasing
Glass tube
Inactive gas
Contact
S
N
S
Fe-Ni alloy reed
N
N
S
(switch off).
OHD principle: Break (B) type
TRS principle : Break (B) type
TRS principle : Break (B) type
（ ■：Permanent magnet ■：Thermorite® ■：Reed switch contact area ）
（ ■：Permanent magnet ■：Thermorite® ■：Reed switch contact area ）
Reset temperature
Action temperature
Reset temperature
Action temperature
Low temperature
Low temperature
Thermal magnet = paramagnet
Thermal magnet = paramagnet
N
N
S
S
S
S
N
N
S
S
N
N
S
S
N
N
S
S
N
N S
S
N
N
S
S
N
N
NEC TOKIN Sensors Vol.14 5
S
S
N
N
S N specifications
●All
in this catalog and production
products
S
N S status of N
S are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
S N
Srequest for a specification sheet N
S
N data
S prior to the purchase.
●Please
for detailed
product
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
N
N
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
Magnetic Flux Forming => Reed switch ON
Magnetic Flux Forming => Reed switch ON
S
S
High temperature
High temperature
Thermal magnet = NO magnetic
Thermal magnet = NO magnetic
N
N
S
S
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
Magnetic Flux ≒0 => Reed switch OFF
Magnetic Flux ≒0 => Reed switch OFF
2015.3.31 0000SENVOL14E1503H1
N
N
Switch ON
Switch ON
Switch OFF
Switch OFF
OHD principle: Make (M) type
TRS principle : Make (M) type
TRS principle : Make (M) type
（ ■：Permanent magnet ■：Thermorite® ■：Gapspacer（SP） ■：Reed switch contact area ）
（ ■：Permanent magnet ■：Thermorite® ■：Gapspacer（SP） ■：Reed switch contact area ）
Reset temperature
Action temperature
Reset temperature
Action temperature
Low temperature
Low temperature
High temperature
High temperature
Thermal magnet = paramagnet
Thermal magnet = paramagnet
Thermal magnet = NO magnetic
Thermal magnet = NO magnetic
N
N
S
S
N
N
S
S
S
S
S
S
N
N
N
N
S
S
N
N
S
S
S
S
N
N
N
N
S SP N
S SP N
S SP N
S SP N
S
S
S
S
N
N
N
N
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
Magnetic Flux ≒0 => Reed switch OFF
Magnetic Flux ≒0 => Reed switch OFF
S
S N
N
S
S
S
S
N
N
N
N
S
S
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
N
N
S
S
N
N
Switch OFF
Switch OFF
N
N
S
S
Switch ON
Switch ON
6 NEC TOKIN Sensors Vol.14
6 NEC TOKIN Sensors Vol.14
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●All
specifications
catalog and
production
status
of products
are to
subject
to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please
request forinathis
specification
sheet
for detailed
product
data prior
the purchase.
●Please
request
a specification
sheet for
detailed
data prior
the purchase.
●Before using
theforproduct
in this catalog,
please
readproduct
"Precautions"
andtoother
safety precautions listed in the printed version catalog.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2015.3.31 0000SENVOL14E1503H1
2015.3.31 0000SENVOL14E1503H1
SE0202_OHD • 8/10/2023
3
Thermal Sensors – OHD Thermal Guard
Magnetic field emitting equipment
such as motors, coils
Magnetic
fieldMagnetic
from equipment
External
Field
OHD installation in external magnetic field
Magnetic field from equipment
Wrong direction Correct direction
N
N
Magnetic field emitting equipment
such as motors, coils
S
S
N
Wrong direction Correct direction
S
S
N
N
N
S
N
S
S
N
Magnet inside OHD is
perpendicular to the external field
→ Less influence
S
Magnet inside OHD is
parallel to the external field
→ Greater Influence
Magnet inside OHD is
parallel to the external field
→ Greater Influence
Magnet inside OHD is
perpendicular to the external field
→ Less influence
3
2
1
0
－1
－2
－3
－4
－5
Operation temperature variation (°C)
Operation temperature variation (°C)
Ferromagnetic material influence
3
BType
2
MType
1
OHD
0
－1
0
－2
BType
2
4
－3
6
8
10
12
Gap distance_d（mm）
14
Soft MType
iron (thickness 3.3mm)
16
OHD
－4
－5
0
2
4
6
8
10
12
Gap distance_d（mm）
14
d
16
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
d
Soft iron (thickness 3.3mm)
SE0202_OHD • 8/10/2023
4
Thermal Sensors – OHD Thermal Guard
Dimensions – Millimeters
Part
Number
Dimensions - Millimeters
OHD1
OHD1
mounting
bracket
Mounting brackets designed specifically
for OHD1 type are provided optionally,
at separate cost.
Part number is OHD1BRACKET.
OHD3
OHD5R
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
5
Thermal Sensors – OHD Thermal Guard
Environmental Compliance
All KEMET Thermal Sensors are RoHS compliant.
Approvals
Certification Body
File Number
Part Type
UL
E67648
OHD1, OHD3 and OHD5R
CSA
LR50414
OHD1, OHD3 and OHD5R
R9750955
OHD1 and OHD3
R9750944
OHD5R
TÜV
Performance Characteristics
Item
Operations
Condition
Judgement
Screw Torque
Recommendation
Performance Characteristics
All types
100,000 times
OHD1 and OHD3 types
100 VAC – 1.67 kΩ (purely resistive load)
OHD5R type
30 VDC – 0.9 kΩ (purely resistive load)
All types
OHD3 type
OHD5R type
1) No stick
2) Contact resistance be within 500 mΩ
0.5 N•m maximum (5 kgf•cm maximum)
M3 screw (non-magnetic)
0.4 N•m maximum (4 kgf•cm maximum)
M3 screw (non-magnetic)
Dip Washing
All types
Using isopropyl alcohol AT normal temperature for 90 seconds
Molded Resin
All types
Alkyd Resin (UL V-0)
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
6
Thermal Sensors – OHD Thermal Guard
Insulation & Temperature Characteristics
Insulation
Withstand
Voltage1
Shape Type
OHD1
OHD3
OHD5R
2,500 VAC/1 minute
or
3,000 VAC/1 second
1,500 VAC/1 minute
or
1,800 VAC/1 second
Minimum
Insulation
Resistance1
Operating
Temperature
Range
Switching
Temperature
Range
Switching
Temperature
Precision2
Differential
Temperature3
500 VDC
to 100 MΩ
−20°C
to +150°C
+30°C
to +130°C
±5°C
10°C
Maximum
Between wire harness and mounting resin surface.
Switching temperature precision does not include measurement error.
3
The differential temperature is also referred to as the hysteresis temperature on thermal sensors.
1
2
Table 1 – Ratings & Part Number Reference
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g)
Approval
OHD1-30M
30°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-35M
35°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-40M
40°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-45M
45°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-50M
50°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-55M
55°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-60M
60°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-65M
65°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-70M
70°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-75M
75°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-80M
80°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-85M
85°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-90M
90°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-95M
95°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-100M
100°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-105M
105°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-110M
110°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-115M
115°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-120M
120°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-125M
125°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-130M
130°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.8
UL & CSA & TÜV
OHD1-30B
30°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-35B
35°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-40B
40°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-45B
45°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-50B
50°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-55B
55°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
7
Thermal Sensors – OHD Thermal Guard
Table 1 – Ratings & Part Number Reference cont.
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g)
Approval
OHD1-60B
60°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-65B
65°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-70B
70°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-75B
75°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-80B
80°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-85B
85°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-90B
90°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-95B
95°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-100B
100°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-105B
105°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-110B
110°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-115B
115°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-120B
120°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-125B
125°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD1-130B
130°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
1.4
UL & CSA & TÜV
OHD3-30M
30°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-35M
35°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-40M
40°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-45M
45°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-50M
50°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-55M
55°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-60M
60°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-65M
65°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-70M
70°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-75M
75°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-80M
80°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-85M
85°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-90M
90°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-95M
95°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-100M
100°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-105M
105°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-110M
110°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-115M
115°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-120M
120°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-125M
125°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-130M
130°C ±5°C
10°C
Make
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.8
UL & CSA & TÜV
OHD3-30B
30°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-35B
35°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-40B
40°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-45B
45°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-50B
50°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-55B
55°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
8
Thermal Sensors – OHD Thermal Guard
Table 1 – Ratings & Part Number Reference cont.
Part
Number
Switching
Temperature
(°C)
Maximum
Differential
Temperature
(°C)
Contact
Type
Maximum
Opening/
Closing
Voltage (V)
Maximum
Opening/
Closing
Current (A)
Maximum
Opening/
Closing
Power (W)
Minimum
Opening/
Closing
Current
Maximum
Contact
Resistance
(mΩ)
Weight
(g)
Approval
OHD3-60B
60°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-65B
65°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-70B
70°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-75B
75°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-80B
80°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-85B
85°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-90B
90°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-95B
95°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-100B
100°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-105B
105°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-110B
110°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-115B
115°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-120B
120°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-125B
125°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD3-130B
130°C ±5°C
10°C
Break
110 AC/DC
0.3 AC/DC
6 AC/DC
0.1 mA/1 VDC
150
2.4
UL & CSA & TÜV
OHD5R-30B
30°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-35B
35°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-40B
40°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-45B
45°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-50B
50°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-55B
55°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-60B
60°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-65B
65°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-70B
70°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-75B
75°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-80B
80°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-85B
85°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-90B
90°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-95B
95°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-100B
100°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-105B
105°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-110B
110°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-115B
115°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-120B
120°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-125B
125°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
OHD5R-130B
130°C ±5°C
10°C
Break
30 DC
0.1 DC
1 DC
0.1 mA/1 VDC
300
1.1
UL & CSA & TÜV
Table 2 – Ratings & Part Number Reference
Part Number
Weight (g)
OHD1BRACKET
0.45
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
9
Thermal Sensors – OHD Thermal Guard
Soldering
OHD1 and OHD5R
Flow Soldering
Iron Soldering
Preheating Temperature
Preheating Time
Heating Temperature
Heating Time
Temperature of Tip
Worktime
100 – 150°C
Within 60 seconds
260°C
10 ±1 seconds
350°C or lower
Within 5 seconds
Temperature of Tip
Worktime
350°C or lower
Within 5 seconds
OHD3
Iron Soldering
Marking
OHD1
OHD3
OHD5R
Lot Code 122
Month of the Year
(1) 1 digit
1 = January
9 = September
X = October
Y = November
Z = December
2 Last Digits of the Year
(2) 2 digits
10 = xx10
11 = xx11
19 = xx19
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
10
Thermal Sensors – OHD Thermal Guard
Packaging
Part Type
OHD1
OHD3
OHD5R
OHD1BRACKET
Packaging Type
Tray
Plastic Bag
Pieces per Tray
Pieces per Box
120
1,200
1,000
700
1,000
100
1,000
Handling Precautions
Precautions to be taken when using Thermal Reed Switches
(Please read these precautions before using our products)
• Do NOT use in close proximity to strong magnetic parts.
• Do NOT use product under mechanical weight load.
• Do NOT use if dropped or severely shocked.
• Do NOT use with a greater load than specified.
• Avoid stress (especially torsion) in case of additional processing.
• Thermal guards have a specific resonance frequency. Please contact a KEMET representative if an oscillation is added.
• OHD1 and OHD5R are designed for printed circuit board insertion. OHD3 is reed wire soldered type.
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
11
Thermal Sensors – OHD Thermal Guard
KEMET Electronics Corporation Sales Offices
For a complete list of our global sales offices, please visit www.kemet.com/sales.
Disclaimer
YAGEO Corporation and its affiliates do not recommend the use of commercial or automotive grade products for high reliability applications or manned space flight.
All product specifications, statements, information and data (collectively, the “Information”) in this datasheet are subject to change. The customer is responsible for
checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given
herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on KEMET Electronics Corporation’s (“KEMET”) knowledge of typical operating conditions for such
applications, but are not intended to constitute – and KEMET specifically disclaims – any warranty concerning suitability for a specific customer application or use.
The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any
technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no
obligation or liability for the advice given or results obtained.
Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component
failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards
(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or
property damage.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicated or that other
measures may not be required.
When providing KEMET products and technologies contained herein to other countries, the customer must abide by the procedures and provisions stipulated in all
applicable export laws and regulations, including without limitation the International Traffic in Arms Regulations (ITAR), the US Export Administration Regulations
(EAR) and the Japan Foreign Exchange and Foreign Trade Act.
KEMET is a registered trademark of KEMET Electronics Corporation.
© KEMET Electronics Corporation • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
SE0202_OHD • 8/10/2023
12
