The Guide - MEM Technical Support

Prospective Fault Level to which Backup is Achieved
Circuit Breakers

Prospective Fault Level to which Discrimination is achieved (kA)

(E) Indicates electronic type. Hi-break F, J & K frame MCCBs may be backed up with HRC fuses to 80kA prospective fault level.

Upstream
Breaker Type		Memshield 2 G Frame MCCB									Memshield 2 F Frame MCCB											J Frame			K Frame		L Frame		M (E) Frame		N (E) Frame	BS 88 Max. Fuse					BS1361 Max. Fuse
Breaker Rating (A)		16	20	32	40	50	63	80	100	125	16	20	32	40	50	63	80	100	125	160	200	160	200	250	320	400	630	800	1000	1250	1600	100	160	200	400	450	100
Fault Rating	kA	16/25	16/25	16/25	16/25	16/25	16/25	16/25	16/25	16/25	25	25	25	25	25	25	25	25	25	25	25	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
MCH301	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	36	36	36	36	36	50	50	65	65	85	80	80	80	80	80	33
MCH302	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH304	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH306	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH308	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH310	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH313	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH316	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	40	25	25	-	-	33
MCH320	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	25	-	-	33
MCH325	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	25	-	-	33
MCH332	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	25	-	-	33
MCH340	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	25	-	-	33
MCH350	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	25	-	-	33
MCH363	10	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	16/20	22	22	22	22	22	22	22	22	22	22	20	20	20	20	-	-	-	-	-	-	-	50	40	-	-	-	33
Breaker Type		Memshield 2 G Frame MCCB									Memshield 2 F Frame MCCB											J Frame			K Frame		L Frame		M (E) Frame		N (E) Frame	BS 88 Max. Fuse					BS1361 Max. Fuse
Breaker Rating (A)		16	20	32	40	50	63	80	100	125	16	20	32	40	50	63	80	100	125	160	200	160	200	250	320	400	630	800	1000	1250	1600	100	160	200	400	450	100
Fault Rating	kA	16/25	16/25	16/25	16/25	16/25	16/25	16/25	16/25	16/25	25	25	25	25	25	25	25	25	25	25	25	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
MGL163/MGH163	16/25	-	-	-	-	-	-	-	-	-	25	25	25	25	25	25	25	25	25	25	25	20	20	20	-	-	-	-	-	-	-	50	40	-	-	-	33
MGL203/MGH203	16/25	-	-	-	-	-	-	-	-	-	25	25	25	25	25	25	25	25	25	25	25	36	36	36	36	36	-	-	-	-	-	80	80	80	80	-	-
MGL323/MGH323	16/25	-	-	-	-	-	-	-	-	-	25	25	25	25	25	25	25	25	25	25	25	36	36	36	36	36	-	-	-	-	-	80	80	80	80	-	-
MGL403/MGH403	16/25	-	-	-	-	-	-	-	-	-	25	25	25	25	25	25	25	25	25	25	25	36	36	36	36	36	-	-	-	-	-	-	80	80	80	-	-
MGL503/MGH503	16/25	-	-	-	-	-	-	-	-	-	25	25	25	25	25	25	25	25	25	25	25	36	36	36	36	36	-	-	-	-	-	80	80	80	80	-	-
MGL663/MGH663	16/25