CH221BMS Equivalent & Substitute Parts

Part Overview

The CH221BMS is a cartridge fuse holder manufactured by Eaton - Bussmann Electrical Division, designed for 100 A circuits at 600V with DIN Rail mounting. This component is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement in existing installations.

The CH221BMS accommodates 22mm x 58mm cartridge fuses in a single-circuit configuration with screw terminal termination. Due to its obsolete status, sourcing direct replacements requires evaluation of functionally equivalent alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

CH221BMS

Eaton - Bussmann Electrical DivisionIn Stock: 973CH221BMS Datasheet

Current PartRFQ

CH221DMSU-F

Eaton - Bussmann Electrical DivisionIn Stock: 1067CH221DMSU-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CH221BMS is determined by the following critical parameters:

• Fuse Size Compatibility: The substitute must accept 22mm x 58mm cartridge fuses
• Current Rating: 100 A capacity must be maintained
• Voltage Rating: Minimum 600V; higher ratings are acceptable
• Mounting Configuration: DIN Rail mounting required
• Circuit Count: Single-circuit configuration
• Termination: Screw terminal connection
• Manufacturer Continuity: Eaton - Bussmann Electrical Division CH Series

The CH221DMSU-F meets all substitution criteria while offering enhanced specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The CH221DMSU-F is the direct substitute for the CH221BMS based on electrical and mechanical parameter alignment. Key selection factors:

• Electrical Compatibility: The CH221DMSU-F maintains 100 A current capacity with a 700V voltage rating, which exceeds the 600V requirement of the original CH221BMS, ensuring safe operation in existing 600V circuits.

• Physical Compatibility: Both components accept identical 22mm x 58mm cartridge fuses and mount on DIN Rail with screw terminal connections, enabling direct mechanical replacement.

• Product Status: The CH221DMSU-F is active production status, providing long-term availability and supply chain stability compared to the obsolete CH221BMS.

• Compliance: The CH221DMSU-F carries RoHS Compliance certification, meeting modern regulatory requirements for electrical components.

• Packaging: The CH221DMSU-F is supplied in bulk packaging, suitable for inventory management and field replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the CH221DMSU-F directly replace the CH221BMS in existing installations?

A: Yes. Both components share identical fuse size (22mm x 58mm), current rating (100 A), circuit count (1), termination style (screw terminal), and DIN Rail mounting. The CH221DMSU-F operates at 700V, which is compatible with 600V circuit applications.

Q: What is the significance of the voltage rating difference between 600V and 700V?

A: The CH221DMSU-F's 700V rating exceeds the CH221BMS's 600V rating. In electrical component selection, a higher voltage rating is acceptable for lower-voltage applications. The CH221DMSU-F will operate safely in any circuit rated at or below 600V.

Q: Are there mechanical differences between these components?

A: No mechanical differences exist in critical dimensions. Both components use 22mm x 58mm cartridge fuses, mount on DIN Rail, and employ screw terminal connections. The CH221DMSU-F includes a microswitch feature, which does not affect mechanical compatibility.

Q: What is the packaging difference, and does it affect compatibility?

A: The CH221BMS packaging is listed as "-" (unspecified), while the CH221DMSU-F is supplied in bulk packaging. Packaging affects logistics and inventory handling but does not impact electrical or mechanical compatibility.

Q: Why is the CH221BMS classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The CH221DMSU-F represents the active equivalent within the same CH Series, providing continued access to compatible fuse holder technology.