8
GAS DISCHARGE
TUBES
Gas Discharge Tubes
335
www.littelfuse.com
LITTELFUSE 3 TERMINAL POTTED ARRESTERS, 18A, 18B,
CONFORMS TO BT SPECIFICATION D2982B TOTALLY
NON-RADIOACTIVE, UL RECOGNIZED
(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.
ORDERING
INFORMATION
PROTECTOR 18A
PROTECTOR 18B
All dimensions in mm
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
18A/18B Series Potted Gas Plasma Arresters
Modified Protector
3 ELECTRODE GDT
a=TIP
b=RING
e=GROUND
(centre electrode)
GRAPHICAL SYMBOL
a b
e
Max Alternating Impulse
Electrical DC Impulse Discharge Discharge Insulation Max
Characteristics Sparkover
1
Sparkover
2
Current
3
Current
4
Resistance
5
Capacitance
6
Holdover
7
(V) (V) (A) (kA) (Ω) (pF) (V)
18A 210-310 800 5 5 1x10
8
30 100
18B 400-500 1000 5 5 1x10
8
30 100
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