BM-1R Equivalent & Substitute Parts

Part Overview

The BM-1R is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) chassis mount switch is rated for 22A AC at 125V with a round pin plunger actuator and solder lug termination. The switch operates with an on-momentary function and is designed for applications requiring reliable snap action switching with high mechanical cycle life. Substitute parts are identified to provide alternative sourcing options when the primary BM-1R becomes unavailable or when design flexibility permits equivalent component selection.

Substiute Parts

BM-1R

Honeywell Sensing and Productivity SolutionsIn Stock: 998BM-1R Datasheet

Current PartRFQ

A-20G

Omron Automation and SafetyIn Stock: 878A-20G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The A-20G from Omron Automation and Safety qualifies as a substitute for the BM-1R based on the following critical parameters:

Matching Parameters:

• Circuit configuration: Both are SPDT switches
• Switch function: Both operate as On-Mom (On-Momentary)
• Actuator type: Both feature round pin plunger actuators
• Mounting type: Both are chassis mount
• Termination style: Both use solder lug termination
• Voltage rating (AC): Both rated at 125V AC
• Product status: Both are active components
• RoHS compliance: Both meet RoHS standards

Substitution Constraints: The A-20G carries a reduced AC current rating of 20A compared to the BM-1R's 22A rating. This represents a 2-ampere reduction in maximum continuous current capacity. The A-20G also exhibits different mechanical and electrical life specifications, a narrower operating temperature range (-25°C to 80°C versus -55°C to 85°C), and different actuation force characteristics. These differences must be evaluated against specific application requirements before substitution.

Parameter Comparison

Engineering Selection Recommendations

Both the BM-1R and A-20G maintain active product status with current manufacturer support. The BM-1R is RoHS Compliant, while the A-20G meets the more stringent ROHS3 Compliant standard. The A-20G additionally carries REACH Affected designation, indicating compliance with European chemical substance regulations.

Selection between these components should be based on application-specific requirements regarding current capacity, temperature extremes, mechanical cycle life, and actuation force characteristics. The BM-1R provides superior performance in high-cycle applications (20,000,000 cycles versus 1,000,000 cycles) and extended temperature operation (-55°C lower limit versus -25°C). The A-20G is suitable for applications where the 20A AC rating is sufficient and where the narrower temperature range and reduced cycle life do not present constraints.

Frequently Asked Questions (FAQ)

Q: Can the A-20G directly replace the BM-1R in all applications?

A: The A-20G qualifies as a substitute only when the application current requirement does not exceed 20A AC. Applications designed for the full 22A capacity of the BM-1R require verification that the 2-ampere reduction does not compromise system performance. Additionally, applications operating below -25°C or above 80°C require the BM-1R's extended temperature range.

Q: What are the primary differences in mechanical characteristics?

A: The A-20G requires significantly higher operating force (400-625gf versus 198gf) and release force (285gf versus 113gf). The A-20G also exhibits greater pretravel (0.051" versus 0.015"), differential travel (0.008" versus 0.001"), and overtravel (0.010" versus 0.005"). These differences affect actuation feel and may impact mechanical interface design.

Q: How do the cycle life ratings compare?

A: The BM-1R is rated for 20,000,000 mechanical cycles, while the A-20G is rated for 1,000,000 mechanical cycles. Applications requiring extended operational life with frequent switching cycles should prioritize the BM-1R.

Q: Are both parts suitable for DC applications?

A: The BM-1R specifications provided indicate AC rating only (22A at 125V AC). The A-20G includes DC ratings (6A at 30V DC). Applications requiring DC switching capability must use the A-20G or verify BM-1R DC performance through manufacturer documentation.

Q: What packaging options are available?

A: Both the BM-1R and A-20G are supplied in bulk packaging. Current inventory includes 946 pieces of BM-1R and 809 pieces of A-20G in new original condition.

Q: Do both parts meet current compliance standards?

A: The BM-1R is RoHS Compliant. The A-20G meets the more recent ROHS3 Compliant standard and carries REACH Affected status. Both components are classified under ECCN EAR99 and HTSUS 8536.50.9040.