Bussmann
Bussmann LPS-RK-17-1/2SPI fuse
A 17 1/2 A time-delay fuse with indicating feature, rated 600 V AC and 300 V DC, Class RK1, 100 kA at 300 V DC and 300 kA at 600 V AC
- 17-1/2 A Class RK1 fuse rated 600 V AC for high-power circuits
- 300 V DC rating with 100kA interrupt capacity protects battery systems
- 300kA AC interrupt rating withstands severe fault currents
- Built-in indicator gives instant visual confirmation of fuse status
- Time-delay dual-element design rides through motor-start surges
Industrial circuit protection
The Bussmann LPS-RK-17-1/2SPI is a Class RK1 fuse rated at 17 1/2 amps for 600 V AC and 300 V DC circuits. Its cylindrical melamine body measures 5 inches long by 13/16 inches in diameter and fits rejection-style fuse blocks such as the HM600 and RM600 series. The dual-element, time-delay design withstands temporary overloads while the indicating feature provides visual confirmation of operation. It suits maintenance teams and OEMs specifying coordinated protection for motor circuits and power distribution equipment.
Interrupt ratings define the limit
This fuse interrupts up to 300 kA at 600 V AC and 100 kA at 300 V DC, so the available fault current at the installation point must not exceed those values. The rejection-style dimensions prevent insertion into non-rejection blocks, enforcing the correct coordination level. Time-delay characteristics allow harmless inrush currents to pass, but sustained overcurrents beyond the 17 1/2 A rating will open the element. Installers must verify the system voltage and prospective short-circuit current against these fixed ratings before specifying the fuse.
Direct replacement for equivalent series
The LPS-RK-17-1/2SPI replaces Littelfuse LLSRK-ID and Mersen A6D-R fuses of the same ampere and voltage ratings without changing the fuse block. The jump is worthwhile when an indicating fuse is needed to speed troubleshooting or when standardising on the LPS-RK-SPI series across a facility. It is not for applications requiring a faster-acting characteristic, a different voltage rating, or a non-rejection mounting style. Nor does it suit circuits where the available fault current exceeds the stated interrupting capacity.
Highlights
- 17-1/2 A Class RK1 fuse rated 600 V AC for high-power circuits
- 300 V DC rating with 100kA interrupt capacity protects battery systems
- 300kA AC interrupt rating withstands severe fault currents
- Built-in indicator gives instant visual confirmation of fuse status
- Time-delay dual-element design rides through motor-start surges
Specifications
| Brand | BUSSMANN |
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Questions about this item
Which amp rating should I choose for a 600 V AC circuit protected by a Class RK1 fuse block?
The LPS-RK-17-1/2SPI is a single 17 1/2 A fuse; select it only when the circuit’s design current and the fuse-block rejection clips both call for that exact rating.
What does the 300 kA interrupt rating at 600 V AC mean once the fuse is installed?
It means the fuse can safely clear a prospective short-circuit current of up to 300 kA on a 600 V AC system without rupturing.
How does the Class RK1 rejection feature limit the fuse blocks I can use?
The rejection clips on HM600 or RM600 series blocks physically prevent insertion of lower-class fuses, ensuring only Class RK1 types like this one can be fitted.
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