Square D Digest 179

UL Listed Maximum Short Circuit Current Ratings—AC only

Heavy Duty Safety Switches

www.se.com/us

Class 3140

UL Listed Maximum Short Circuit Current Ratings—AC only NOTE: Consult the wiring diagram of the switch to verify the UL Listed short circuit current rating. Table 3.19: Fusible Safety Switches HeavyDuty Safety Switch Type ULListed FuseClass UL Listed Short Circuit Current Ratings Fusible H, K 10kA R, J, L 200kA [17] 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.

Table 3.20: Non-Fusible Safety Switches [18] [19] Switch Rating (A)

3-Phase 480Vac

250Vdc / 600Vdc

Fuse or Circuit Breaker Type [20]

240Vac

600Vac

With Upstream Fuse Protection All

H, K

10kA

10kA

10kA

Up to10kA

R,T,J,L

200kA

200kA

200kA

With Upstream Circuit Breaker Protection All

Any brand circuit breaker

10kA 25kA 65kA 65kA 65kA 65kA 14kA 18kA 25kA 65kA 65kA 65kA 65kA 22kA 25kA 25kA 65kA

10kA 18kA 35kA 35kA 35kA 35kA 14kA 18kA 18kA 35kA 35kA 35kA 35kA 22kA 25kA 18kA 35kA 65kA 65kA 65kA

10kA 14kA 18kA 25kA 35kA 35kA 14kA 18kA 14kA 18kA 25kA 35kA 35kA 22kA 25kA 14kA 18kA 25kA 50kA 65kA

30–100 30–100 30–100 30–100 30–100 30–100 30–100

HD HG HJ HL HR FA FH

3 SAFETY SWITCHES

HD, JD HG, JG HJ, JJ HL, JL HR, JR

200 200 200 200 200 400 400

Up to10kA

LA LH LD LG LJ LL LR

400–600 400–600 400–600 400–600 400–600

100kA 100kA 100kA

[17] On 600 V, 200 A switches, 100,000 A max. on corner grounded delta when using Class J or R fuses. [18] For NEMA Type 4X Fiberglass Reinforced Polyester switches, see page 3-15. [19] NEMA Type 7/9 SCCR 10 kAIR 600 Vac maximum. [20] Ampere rating of fuse or circuit breaker not to exceed switch ampere rating.

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