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
Max
1x10
8
1x10
8
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 Sparkover
1
Sparkover
2
(V)
(V)
18A
18B
210-310
400-500
800
1000
Alternating
Discharge
Current
3
(A)
5
5
Impulse
Discharge
Current
4
(kA)
5
5
Insulation
Resistance
5
Capacitance
6
Holdover
7
(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
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