Controlled Switching — Buyer´s Guide
J-2
Edition 2, 2006-09
Application Circuit Breakers with Staggered Poles
Example of Circuit Breakers with Staggered Poles
Choice of Three-pole Operated Circuit Breaker with Staggered Poles, Existing Versions
Type of
Operation
Circuit Breaker Designa-
tion
Load Electric Cir-
cuit of Load
Magnetic
Circuit
Frequency
(Hz)
Staggering for Intended
Operation.
(ms)
Pole A Pole B Pole C
Closing LTB 72.5-170D1/BUS Capacitor Y-N and Delta 50 5 0 0
HPL 72.5-300B1US
50 5 0 0
LTB 72.5-170D1/BUS
60 4.2 0 0
HPL 72.5-300B1US
60 4.2 0 0
LTB 72.5-170D1/BGS
Y-0 50 6.7 0 3.3
LTB 72.5-170D1/BGS
60 5.6 0 2.8
HPL 72.5-300B1GS
50 0 6.7 3.3
LTB 245E1GS
50 0 6.7 3.3
HPL 72.5-300B1GS
60 0 5.6 2.8
LTB 245E1GS
60 0 5.6 2.8
Opening HPL 300B1/GS *) Reactor Y-0 5-leg/bank 50 0 6.7 3.3
US = Ungrounded bank, GS = Grounded bank
*) Please note: For reactor deenergization, the reactor should be ≥150 Mvar at 300 kV.
For other applications with tree-pole operated mechanical staggered circuit breakers, please contact ABB Power Technologies,
High Voltage Products, Ludvika, Sweden
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