Class H(K) and R modular ferrule fuse blocks (HM and RM)

HM Class H(K) and RM Class R modular ferrule fuse blocks up to 60 amps

These new Bussmann series fuse blocks contain multiple features that increase versatility, reduce labor and enhance safety for any panel or electrical system design.

Data sheet no. 10289

250 V and 600 V 30, 60, 100, 200, 400 and 600 A RM blocks data sheet no. 10489

Product profile no. 10309

Drawing downloads (PDF, DXF/DWG, IGS, STEP)

Catalog Number HM25030-(poles)(terminal type) - 250V, 30A Class H(K) blocks, HM25060-(poles)(terminal type) - 250V, 60A Class H(K) blocks, HM60030-(poles)(terminal type) - 600V, 30A Class H(K) blocks, HM60060-(poles)(terminal type) - 600V, 60A Class H(K) blocks, RM25030-(poles)(terminal type) - 250V, 30A Class R blocks, RM25060-(poles)(terminal type) - 250V, 60A Class R blocks, RM60030-(poles)(terminal type) - 600V, 30A Class R blocks, RM60060-(poles)(terminal type) - 600V, 60A Class R blocks
Volts - 250V Class H(K) and R
- 600V Class H(K) and R
Amps Up to 60A
Withstand - 10kA RMS Sym Class H(K)
- 200kA RMS Sym Class R
Dimensions See data sheet no. 10289
Agency information Blocks- UL Listed E14853 - IZLT
- CSA Certified 47235-6225-01
- CE
- RoHS Compliant
- Conflict mineral free
- REACH declaration available upon request
- UL Listed E58836 - JDVS
- CSA Certified 47235-6225-01
- RoHS Compliant
- REACH declaration available upon request
Flammability ratings - Blocks — UL 94V0, self-extinguishing
- Covers — UL 94HB, self-extinguishing
Operating and storage temperature range: Blocks
-40°C to +120°C
- Non-Indicating -40°C to +120°C
- Indicating -20°C to +90°C*
* Indication requires minimum 90Vac/dc and closed circuit to illuminate.


  • Available in 1-, 2-, and 3-pole configurations to meet stocking requirements.
  • To reduce inventory, assembly time and labor, modular single-pole blocks snap-together for tool-less assembly of multiple poles at point of use.
  • DIN-Rail and panel mount versatility allows one product to be used for multiple applications with lower inventory cost.
  • Save panel space with the smallest width dimension on the market.
  • Optional see-through, IP20 finger-safe covers enhance safety with lock-out/tag-out capability.
  • Optional open fuse indication on covers speeds troubleshooting.
  • Easy circuit identification with available universal marker labels for blocks and covers.

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