Bussmann Rejection-Style Fuse ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$63.16
Bussmann Rejection-Style Fuse Block for Class J and Class R Fuses

Bussmann Rejection-Style Fuse Block for Class J and Class R Fuses

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Model: RM25030-2CR

In Stock (leaves warehouse same day if ordered before 3pm ET)

$63.16
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Bussmann Rejection-Style Fuse Block for Class J and Class R Fuses

The Bussmann fuse block family covers rejection-style mounting platforms engineered to hold and secure Class J and Class R fuses within industrial and commercial power distribution equipment. This fuse block line is available in two configurations: a Class J version rated 600V, 60A, 3-Pole, and a Class R version rated 250V, 30A, 2-Pole. Each configuration provides a secure, code-compliant mounting platform for overcurrent protection in panelboards, switchboards, and motor control centers, with rejection-style construction that ensures proper fit and clearance for the corresponding fuse class, supporting reliable, coordinated circuit protection in demanding electrical systems.

Key Features

  • Multi-Pole Configuration: Available in 3-Pole (Class J) and 2-Pole (Class R) configurations, mounting multiple fuse positions on a single block to simplify installation and wiring while reducing the panel space required for individual single-pole blocks.
  • Voltage Rating Range: The Class J configuration is rated 600V while the Class R configuration is rated 250V, covering a wide range of commercial and industrial power distribution systems that require dependable voltage-rated overcurrent protection components.
  • Amperage Rating Range: Sized to accept fuses up to 60A (Class J) or 30A (Class R), delivering dependable overcurrent protection for connected feeder and branch circuits in panelboards and switchboards.
  • Class J and Class R Fuse Compatibility: Purpose-built to accept either Class J or Class R fuses depending on configuration, ensuring the correct fit, clearance, and current-limiting performance coordination expected of these rated overcurrent protection devices.
  • Rejection-Style Mounting: Each fuse block design is built to accept only its designated fuse class, helping installers maintain proper fuse class coordination throughout the distribution system.
  • Bussmann Build Quality: Manufactured by Bussmann, a long-established name in circuit protection components used throughout industrial and commercial electrical installations.

Technical Specifications

  • Class J Configuration: 600V, 60A, 3-Pole
  • Class R Configuration: 250V, 30A, 2-Pole
  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Panelboard and Switchboard Overcurrent Protection
  • Motor Control Centers
  • Industrial Power Distribution Equipment
  • OEM Electrical Equipment and Machinery
  • Service Entrance and Feeder Circuit Protection
  • Three-Phase and Two-Pole Commercial and Industrial Circuits

Why Bussmann?

Bussmann is a widely recognized manufacturer of circuit protection products used throughout commercial and industrial electrical systems. This fuse block family's rejection-style construction, available across Class J (600V, 60A, 3-Pole) and Class R (250V, 30A, 2-Pole) configurations, reflects the fit, form, and rating precision electrical professionals rely on for consistent, code-compliant overcurrent protection. Choosing a genuine Bussmann fuse block helps ensure proper coordination with Class J or Class R fuses for dependable, long-term circuit performance across panelboards, switchboards, and industrial distribution equipment.

Manufacturer Resources

Product Specs

Product Type:
Fuse Block
Voltage Rating:
600V
Amperage Rating:
60A
Configuration:
3-Pole
Series:
Class J
Department:
Electrical
Product Subgroup:
Fuse Holders & Blocks
list_batch:
BUSS-20260919
Product Group:
Circuit Protection

Bussmann RM25030-2CR – Frequently Asked Questions

1) What is the difference between the two Bussmann rejection-style fuse blocks, JM60060-3CR and RM25030-2CR?
They are built for different fuse classes. JM60060-3CR is the Class J block, rated 600V, 60A, 3-pole. RM25030-2CR is the Class R block, rated 250V, 30A, 2-pole. Pick by the fuse class your drawing or existing panel calls out, then confirm the pole count matches the circuit: 3-pole for a three-phase feeder, 2-pole for a single-phase or two-pole circuit.
2) I need a 600V Class R fuse block, not 250V. What are my options?
The Bussmann Class R block here is rated 250V, so it will not serve a 600V Class R application. For a 600V Class R block, the Littelfuse LFR60030-3CID is rated 600V, 30A, Class R. If your circuit is 600V and you can specify the fuse class, the Bussmann Class J block (JM60060-3CR) is 600V and goes to 60A, 3-pole.
3) What is an alternative to the Bussmann RM25030-2CR Class R fuse block if the circuit runs at 480V instead of 250V?
The Bussmann RM25030-2CR is a Class R block rated 250V, 30A, 2-pole, so it is matched to 250V systems. For a Class R fuse on a higher-voltage circuit, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V 30A in a 3-pole arrangement. Both accept Class R fuses at 30A; the difference is the voltage rating and the pole count, so confirm how many phases the opening needs before choosing.
4) Can a Littelfuse LFR60030-3CID be used in place of the Bussmann JM60060-3CR?
Not interchangeably. The Bussmann JM60060-3CR is a rejection-style block built to accept Class J fuses at 600V, 60A, 3-pole, while the Littelfuse LFR60030-3CID accepts Class R fuses at 600V 30A. Both are 600V three-pole blocks, but the fuse classes differ and rejection-style construction accepts only its designated class, so a Class J fuse will not seat in the Class R block. Match the block to the fuse class called out on the drawing.
5) Will a 60A Class J fuse block work if my circuit only needs 30A or 40A?
Yes. The Class J block is sized to accept Class J fuses up to 60A at 600V, so any Class J fuse at or below 60A fits the same block. The amp rating on a fuse block is a maximum, not a required value. Size the fuse to the circuit and use the 60A block as the mounting platform.
6) Do Bussmann fuse blocks come with fuses included?
No. A fuse block is the mounting and connection platform only. The Class J version (JM60060-3CR) holds three Class J fuses and the Class R version (RM25030-2CR) holds two Class R fuses, and those fuses are ordered separately to the amp rating your circuit calls for.
7) Is a Class J block the right choice for motor branch circuit protection in an MCC?
Class J is commonly specified where a current-limiting fuse with a compact footprint is wanted, and the Bussmann 600V 60A 3-pole Class J block is listed for motor control centers, panelboards, switchboards and OEM machinery. The rejection construction matters here: once a Class J block is in, a later fuse swap cannot drop in a lower-performing class by mistake. If your spec instead calls out Class RK1 or RK5, use the Class R block and watch the voltage, the Bussmann Class R version is 250V.
8) Is a Class G fuse block an acceptable substitute for a Class R fuse block?
No. Fuse classes are not cross-compatible: the Bussmann RM25030-2CR is built to accept Class R fuses at 250V, 30A, and the Littelfuse LFG60015-1SQDINR accepts Class G fuses at 600V 15A. Rejection-style construction is specifically designed to accept only the designated class, which is what keeps fuse class coordination intact through the distribution system. Replace a Class R block with another Class R block.
9) What is the difference between the Bussmann fuse blocks and Littelfuse POWR-BLOKS LD Series?
The Bussmann blocks are rejection-style platforms offered as Class J at 600V, 60A, 3-pole and Class R at 250V, 30A, 2-pole, intended for panelboards, switchboards and motor control centers. The Littelfuse LD Series POWR-BLOKS is a bolt-in mounting fuse block family. If your panel is drilled for bolt-in mounting hardware, the LD Series addresses that mounting method; if you are specifying by fuse class and rating, the Bussmann Class J and Class R configurations state those directly.
10) Why use a 3-pole fuse block instead of three single-pole blocks in a panel?
A single 3-pole block carries all three fuse positions on one body, so there is one piece to mount and align instead of three. That cuts the panel space needed compared with individual single-pole blocks and simplifies the wiring run. The Bussmann Class J block is the 3-pole version, rated 600V, 60A.
How fast can I get the Bussmann RM25030-2CR delivered?
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Can I return it if it doesn’t work for me?
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Does the Bussmann RM25030-2CR come with a warranty?
Absolutely. The Bussmann RM25030-2CR is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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