Bussmann
Bussmann LPS-RK-50SPI Fuse 50 A 600 V AC Class RK1 Indicating Time-Delay
A 50 A Class RK1 time-delay fuse with indicating feature for 600 V AC circuits
- 50 A rated current protects 600 V AC circuits
- Time-delay characteristic tolerates motor start-up surges
- Visual indicator shows blown status at a glance
- 300 kA interrupt rating clears heavy faults safely
- Class RK1 rejection fit prevents wrong fuse installation
Application and User
The Bussmann LPS-RK-50SPI is a 50 A Class RK1 fuse rated for 600 V AC and 300 V DC. It suits electrical contractors and maintenance teams who need indicating, time-delay protection for motor circuits and general-purpose loads. The cylindrical body fits rejection-style fuse blocks such as the HM600 and RM600 series. Buyers who need a different amperage, voltage class or a non-indicating version should select another part.
Sustained-Load Behaviour
The dual-element construction provides time-delay characteristics that ride through temporary overloads such as motor starting currents without nuisance opening. Under sustained fault conditions the fuse interrupts up to 300 kA at 600 V AC and 100 kA at 300 V DC. The melamine body maintains structural integrity during high-energy interruption events. The indicating feature gives immediate visual confirmation of fuse status after a fault.
Decisive Specification
The Class RK1 rating combined with a 50 A / 600 V AC rating is the single specification that determines whether this fuse matches the circuit design and the rejection block installed. An incorrect class or ampere rating will either fail to coordinate with downstream devices or physically not fit the block. Verify the circuit requires Class RK1 at 50 A before purchasing.
Highlights
- 50 A rated current protects 600 V AC circuits
- Time-delay characteristic tolerates motor start-up surges
- Visual indicator shows blown status at a glance
- 300 kA interrupt rating clears heavy faults safely
- Class RK1 rejection fit prevents wrong fuse installation
Specifications
| Brand | BUSSMANN |
|---|
Questions about this item
Does the LPS-RK-50SPI generate noticeable heat or noise when running at 50 A all day?
The fuse operates silently and produces only normal resistive heat at its rated 50 A; no active cooling or audible components are present.
What fuse block must I already own for this Class RK1 LPS-RK-50SPI to fit?
A rejection-style fuse block from the HM600 or RM600 series is required to accept the cylindrical 5-1/2 in body.
Will this 600 V AC LPS-RK-50SPI coordinate with older 300 V DC equipment on the same circuit?
Yes, the dual-element design carries a 300kA interrupt rating at 600 V AC and 100kA at 300 V DC for mixed-voltage coordination.
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