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Supplemental and Obsolescence Digest 174

Special Construction Circuit Breakers

Grounded BØ Systems

Class 600

Circuit Breakers for Grounded B-Phase (BØ) (Corner-grounded Delta) Systems (No Additional Charge)

Ordering Information For Grounded BØ Circuit Breakers

1.	There is no additional charge for grounded BØ circuit breakers.

2.	For use on 480 V systems, FH, KH, LH and MH type circuit breakers must be ordered as 600 V versions and with a 5861 suffiix (i.e. FHL361005861).

3.	For use on 240 V systems, FH type circuit breakers may be ordered as 480 V versions with a 5861 suffix (i.e. FHL341005861).

4.	FA, KA, LA, and MA type circuit breakers are not available with grounded B phase markings.

 

5.	Two-pole 240 V grounded B-phase circuit breakers (except EDB, EGB, EJB, QB, QD, QG, and QJ) will be built using three-pole modules.

6.	Two-pole grounded BØ circuit breakers will be labeled with 240 Vac interrupting ratings. Three-pole grounded BØ circuit breakers will be labeled with 480 Vac interrupting ratings.

7.	No self-certification is available for interrupting ratings greater than shown in the tables below.

 

 

Table 3.58:

Application Data for 240 Vac 3Ø Corner-grounded Delta System

Cat. No. Prefix	Poles	UL Listed Interrupting Rating
		Ampere Rating	240 Vac Interrupting Rating
QO-H, QOB-H	2	15–100 A	5 kA
QB, QD, QG, QJ	2a	70–250 A	10 kA
EDB, EGB, EJB	2a	15–125 A	18 kA, 35 kA, 65 kA
HD, HG, HJ, HL	2a	15–150 A	18 kA, 35 kA, 65 kA, 100 kA
JD, JG, JJ, JL	2b	150–250 A
FH, FHL	2b	15–100 A	42 kA
KH, KHL	2b	70–250 A
LH, LHL	2b	125–400 A	30 kA
MH, MHL	2b	300–1000 A	65 kA
MG, MJ Electronic Trip	2bc	300–800 A
PH	2b	2000 A	125 kA
PG, PJ, PK, PL Electronic Trip Unit	2bc	600–1200 A	65 kA
RJ Electronic Trip Unit	2bc	1200–2500 A	100 kA
RL Electronic Trip Unit	2bc	1200–2500 A	125 kA
MG, MJ Electronic Trip Unit	3c	300–800 A	65 kA
PG, PK Electronic Trip Unit	3c	600–1200 A
PG, PK Micrologic® Trip Unit	3c	250–1200 A
PJ, PL Electronic Trip Unit	3c	600–1200 A	100 kA
PJ, PL Micrologic Trip Unit	3c	250–1200 A
RG, RK Electronic Trip Unit	3c	1200–2500 A	65 kA
RG, RK Micrologic Trip Unit	3c	600–2500 A
RJ Electronic Trip Unit	3c	1200–2500 A	100 kA
RJ Micrologic Trip Unit	3c	600–2500 A
RL Electronic Trip Unit	3c	1200–2500 A	125 kA
RL Micrologic Trip Unit	3c	600–2500 A
a Standard labeling includes grounded B phase. b Built using 3P module. c Electronic = ET1.0 Electronic Trip System Micrologic = 3.0, 5.0, 3.0A, 5.0A, 6.0A, 5.0P, 6.0P, 5.0H and 6.0 H Micrologic Trip System.

 

 

Three-pole circuit breakers must be used on three-phase 480 V corner-grounded delta systems. The outside poles are to be connected to the ungrounded phase and the grounded conductor connected to the center pole. Connecting the circuit breaker in a manner other than that described or shown may result in an unsafe application of the circuit breaker.

 

 

Table 3.59:

480 Vac 3Ø Corner-grounded Delta System

Cat. No. Prefix	Polesd	UL Listed Interrupting Ratingd
		Ampere Rating	480 Vac Interrupting Rating
HD, HG, HJ, HL	3	15–150 A	18 kA, 35 kA, 65 kA, 100 kA
JD, JG, JJ, JL	3	150–250 A
FH, FHL	3	15–100 A	10 kA
KH, KHL	3	70–250 A	14 kA
LH, LHL	3	125–400 A	14 kA
MH, MHL	3	300–1000 A	18 kA
MG, MJ Electronic Trip Unit	3e	300–800 A	35 kA
PH	3	2000 A	25 kA
PG, PK Electronic Trip Unit	3e	600–1200 A	35 kA, 65 kA
PG, PK Micrologic Trip Unit	3e	250–1200 A
PJ, PL Electronic Trip Unit	3e	600–1200 A	65 kA, 100 kA
PJ, PL Micrologic Trip Unit	3e	250–1200 A
RG, RJ, RK RL Electronic Trip Unit	3e	1200–2500 A	35 kA, 65 kA, 100 kA
RG, RJ, RK, RL Micrologic Trip Unit	3e	600–2500 A
NT	3	800–1200	100 kA
NW	3	800–6000	150 kA
d The grounded phase should be connected through the center pole only. e Electronic = ET1.0 Electronic Trip System Micrologic = 3.0, 5.0, 3.0A, 5.0A, 6.0A, 5.0P, 6.0P, 5.0H and 6.0 H Micrologic Trip System.

 

 

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