External fuse protection
Fuse type Class J
For alternatives to the UL fuses of the class “J”, be sure to refer to the UL standard “UL 508A, chapter SB4.2.3, Exception No. 1”.
Device | Fuse type | max. SCCR |
|---|---|---|
AX8620 | max. 25 A | 5 kA |
AX8640 | max. 50 A | 5 kA |
AX8525 | max. 100 A | 10 kA |
AX8540 | max. 100 A | 10 kA |
Fuse type Class J + semiconductor fuse
 | Series connection for effective line protection Semiconductor fuses only serve as short-circuit protection. A Class J fuse must always be connected in series for line protection. |
When using semiconductor fuses, be sure to use the exact type specified for the device:
Device | Fuse type | Semiconductor fuse | max. SCCR |
|---|---|---|---|
AX8620 | Class J max. 25 A | Bussmann FWC-32A10F, 10x38 mm, type aR, 32 A | 65 kA |
AX8640 | Class J max. 50 A | Bussmann FWP-63A22F, 22x58 mm, type aR, 63 A | 65 kA |
Fuse type Circuit breaker
Circuit breakers must have UL approval. The acceptance test was carried out with Siemens type 3VA5112-6ED31-0AA0. Alternatives to the above types may also be used if they are UL approved.
Device | Protection | max. SCCR |
|---|---|---|
AX8525 | max. 125 A | 65 kA |
AX8540 | max. 125 A | 65 kA |
Protection 24 V DC
Device | Protection |
|---|---|
AX8620 | 20 A |
AX8640 | 20 A |
AX8525 | 20 A |
AX8540 | 20 A |