| Circuit | Load | Ampere Rating | Class | Fuse Type | Voltage Rating | Interrupting Rating (kA) | Bussmann | Remarks |
|---|---|---|---|---|---|---|---|---|
| Main, Feeder and Branch | Conventional Dimensions - Class RK1, RK5, L | |||||||
| All type loads (optimum overcurrent protection) | 0-600A | RK1 | Dual-element, time-delay | 250V 600V |
300 | LPN-RK LPS-RK |
All purpose fuses. Great for combined short-circuit and overload protection. | |
| 601-6000A | L | Time-delay | 600V | 300 | KRP-C | |||
| Motors, welders, transformers, capacitor banks (circuits with heavy inrush currents) | 0-600A | RK5 | Dual-element, time-delay | 250V 600V |
200 | FRN-R FRS-R |
Moderate degree of current-limiation. Time-delay passes surge current. | |
| 601-4000A | L | Time-delay | 600V | 200 | KLU | All purpose fuse. Time-delay passes surge currents. | ||
| Non-motor loads (circuits with no heavy inrush currents.) | 0-600A | RK1 | Fast-acting | 250V 600V |
200 | KTN-R KTS-R |
Must be sized larger (up to 300%) for circuits with surge currents. | |
| 601-6000A | L | Fast-acting | 600V | 300 | KTU | High performance fuse | ||
| Reduced Dimensions for Installation in Restricted Space | ||||||||
| Any type loads (optimum overcurrent protection) | 0-100A | CF | Finger-safe, dual-element, time-delay | 600V | 300 | TCF | All purpose fuses. Great for combined short-circuit and overload protection. | |
| 0-600A | J | Dual-element, time-delay | 600V | 300 | LPJ | |||
| Power electronics applications (drives, SSR) | J | High speed | 600V | 200 | DFJ | Where branch protection is needed with high speed fuse characteristics | ||
| Non-motor loads (circuits with no heavy inrush current) | J | Quick-acting | 600V | 200 | JKS | Very similar to KTS-R but smaller. | ||
| 0-1200A | T | Fast-acting | 300V 600V |
200 | JJN JJS |
The space saver. | ||
| Branch | ||||||||
| Motor loads (circuits with heavy inrush current) | 0-30A | CC | Time-delay | 600V | 200 | LP-CC | Very compact. Rejection feature. | |
| Non-motor loads | 0-30A | CC | Fast-acting | 600V | 200 | KTK-R | ||
| Control transformer circuits and lighting ballasts, etc. | 0-30A | CC | Time-delay | 600V | 200 | FNQ-R | ||
| General purpose (lighting panelboards) | 0-20A 21-60A |
G | 600V 480V |
100 | SC | Current-limiting | ||
| General Purpose (non-current limiting) | ||||||||
| Miscellaneous | 0-600A | H or K5 | 250V 600V |
10 | NON NOS |
Modern cartridge fuse | ||
| Plug fuses for branch circuits and small component protection | 0-30A | S | Dual-element, time-delay | 125V | 10 | S | Base threads differ based on size (rejecting.) Type T and S recommended for motor circuits. T and W have Edison base. | |
| 125V | 10 | T | ||||||
| 0.5-12A | 125V | 10 | W | |||||