8
GAS DISCHARGE
TUBES
Gas Discharge Tubes
335
w w w . l i t t e l f u s e . c o m
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/sec.
(3) Measured at 1 sec duration, 5 shots @ 3 min intervals, 50Hz.
(4) Measured using 8/20sec, 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)
(
)
(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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