UL Listed Maximum SCCR — AC Safety Switches

UL Listed short-circuit current ratings (SCCR) for heavy-duty single-throw fusible and non-fusible safety disconnect switches used in commercial and industrial electrical systems. Covers approved fuse classes, circuit breaker combinations, and upstream overcurrent protection options, with SCCR values up to 200 kA depending on switch type, voltage class, and protective device configuration.

Fusible Safety Switches — Ratings

note

Consult the wiring diagram in the technical drawing of the switch to verify the UL Listed short circuit current rating.

Fusible Safety Switches

Heavy Duty Safety Switch Type	UL Listed Fuse Class	UL Listed Short Circuit Current Ratings
Fusible	H, K	10 kA
Fusible	R, J, L	200 kA ^[1]

Non-Fusible Safety Switches — Ratings

Systems equal or less than 10 kAIR SCCR —Any brand of circuit breaker or fuse not exceeding the ampere rating of the switch may be used in conjunction with a non-fusible safety switch.

Systems above 10 kAIR SCCR—The UL Listed short circuit current rating for Square D non-fusible switches is based upon the switch being used in conjunction with fuses or Square D circuit breakers or Mag-Gard motor circuit protectors.

NEMA Type 7/9 SCCR 10 kAIR 600 Vac maximum.

For NEMA Type 4X Fiberglass Reinforced Polyester switches, see Fiberglass Reinforced Polyester Switches — NEMA Type 4X.

Non-Fusible Safety Switches

Switch Rating (A)	Fuse or Circuit Breaker Type ^[2]	Three-Phase			250 Vdc / 600 Vdc
Switch Rating (A)	Fuse or Circuit Breaker Type ^[2]	240 Vac	480 Vac	600 Vac	250 Vdc / 600 Vdc
With Upstream Fuse Protection
All	H, K	10 kA	10 kA	10 kA	Up to 10 kA
All	R,T,J,L	200 kA	200 kA	200 kA	Up to 10 kA
With Upstream Circuit Breaker Protection
All	Any brand circuit breaker	10 kA	10 kA	10 kA	Up to 10 kA
30–100	HD	25 kA	18 kA	14 kA
30–100	HG	65 kA	35 kA	18 kA
30–100	HJ	65 kA	35 kA	25 kA
30–100	HL	65 kA	35 kA	35 kA
30–100	HR	65 kA	35 kA	35 kA
30–100	FA	14 kA	14 kA	14 kA
30–100	FH	18 kA	18 kA	18 kA
200	HD, JD	25 kA	18 kA	14 kA
200	HG, JG	65 kA	35 kA	18 kA
200	HJ, JJ	65 kA	35 kA	25 kA
200	HL, JL	65 kA	35 kA	35 kA
200	HR, JR	65 kA	35 kA	35 kA
400	LA	22 kA	22 kA	22 kA
400	LH	25 kA	25 kA	25 kA
400–600	LD	25 kA	18 kA	14 kA
400–600	LG	65 kA	35 kA	18 kA
400–600	LJ	100 kA	65 kA	25 kA
400–600	LL	100 kA	65 kA	50 kA
400–600	LR	100 kA	65 kA	65 kA

Section 3: Safety Switches