18A

Gas Discharge Tubes Modified Protector 18A/18B Series Potted Gas Plasma Arresters Features • Conforms to BT specifications D2982B • Hermetically sealed eclosure for use in underground joints and pole tops. • Flying leads for easy connection to IDC or screw terminals. • High surge capability • Conforms to BT specification D2982B • Flame retardent materials to UL 94V0 ® a b e 3 ELECTRODE GDT a=TIP b=RING e=GROUND (centre electrode) GRAPHICAL SYMBOL 8 All dimensions in mm GAS DISCHARGE TUBES Max 1x108 1x108 30 30 100 100 LITTELFUSE 3 TERMINAL POTTED ARRESTERS, 18A, 18B, CONFORMS TO BT SPECIFICATION D2982B TOTALLY NON-RADIOACTIVE, UL RECOGNIZED Max Electrical DC Impulse Characteristics Sparkover1 Sparkover2 (V) (V) 18A 18B 210-310 400-500 800 1000 Alternating Discharge Current3 (A) 5 5 Impulse Discharge Current4 (kA) 5 5 Insulation Resistance5 Capacitance6 Holdover7 (Ω) (pF) (V) (1) Measured using a rate of rise of voltage of 100V/s. (2) Measured using a rate of rise of voltage of 1KV/µsec. (3) Measured at 1 sec duration, 5 shots @ 3 min intervals, 50Hz. (4) Measured using 8/20µsec, 5 shots each polarity. (5) Measured at ±170V dc (18A) or ±350V dc (18B). (6) Measured at 1 MHz, Line to ground. (7) Measured using BT test circuit. 335 ORDERING INFORMATION PROTECTOR 18A PROTECTOR 18B w w w. l i t t e l f u s e . c o m