Honeywell BZ-3R Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell BZ-3R is an active-status SPDT snap action switch designed for chassis mount applications. This switch delivers 15A AC and 500mA DC switching capacity at 125V across both AC and DC circuits. The round pin plunger actuator and solder lug termination provide reliable performance in industrial control and safety applications. Substitute parts are identified to address inventory availability, extended operating temperature ranges, enhanced ingress protection, or specific mechanical life requirements while maintaining core electrical compatibility.

Substiute Parts

BZ-3R

Honeywell Sensing and Productivity SolutionsIn Stock: 732BZ-3R Datasheet

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A-20G

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

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Z-15E

Omron Automation and SafetyIn Stock: 786Z-15E Datasheet

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Z-15G55

Omron Automation and SafetyIn Stock: 981Z-15G55 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Honeywell BZ-3R is determined by the following core parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Actuator type must be Round Pin Plunger
• Mounting type must be Chassis Mount
• Termination style must be Solder Lug
• AC voltage rating must support 125V minimum
• AC current rating must support 15A minimum

Secondary Consideration Parameters:

• DC voltage and current ratings (application-dependent)
• Operating temperature range (application environment-dependent)
• Mechanical life cycles (duty cycle-dependent)
• Ingress protection rating (environmental exposure-dependent)
• RoHS and regulatory compliance status

All three substitute parts (Omron A-20G, Z-15E, and Z-15G55) satisfy primary compatibility criteria. Differences in DC ratings, temperature ranges, mechanical life, and ingress protection determine suitability for specific application contexts.

Parameter Comparison

Engineering Selection Recommendations

Omron A-20G Substitution: The A-20G provides higher AC current capacity (20A) and superior DC current handling (6A versus 500mA). This part is suitable for applications requiring increased current margin on AC circuits. However, the A-20G operates within a narrower temperature range (-25°C to 80°C) compared to the BZ-3R and exhibits significantly lower mechanical life (1,000,000 cycles). The A-20G is ROHS3 compliant and REACH affected. Select this substitute only when higher AC current capacity is required and the reduced temperature range and mechanical life are acceptable for the application.

Omron Z-15E Substitution: The Z-15E maintains the 15A AC current rating of the BZ-3R and provides full 15A DC current capacity. Operating position and release force are identical to the BZ-3R. However, the Z-15E operates within a narrower temperature range (-25°C to 80°C) and has substantially lower mechanical life (300,000 cycles). The Z-15E is RoHS compliant. Select this substitute when DC current capacity must match AC capacity and the reduced temperature range and mechanical life are acceptable.

Omron Z-15G55 Substitution: The Z-15G55 matches the BZ-3R in AC current rating (15A), mechanical life (20,000,000 cycles), and operating position (0.625"). This part provides enhanced ingress protection (IP62 versus unspecified) and is suitable for environments with moisture or particulate exposure. The Z-15G55 operates within a narrower temperature range (-15°C to 80°C) and provides 6A DC current capacity. The Z-15G55 is ROHS3 compliant and REACH affected. Select this substitute when environmental protection and mechanical life equivalence are required.

Compliance Status: All substitute parts maintain EAR99 ECCN classification and MSL 1 rating. The BZ-3R and Z-15E are RoHS compliant; A-20G and Z-15G55 are ROHS3 compliant. A-20G and Z-15G55 are REACH affected.

Frequently Asked Questions (FAQ)

Q: Can the Omron A-20G replace the Honeywell BZ-3R in all applications?

A: The A-20G satisfies core electrical compatibility (SPDT, On-Momentary, 125V AC, 15A+ AC capacity, round pin plunger, chassis mount, solder lug). However, the A-20G operates only to -25°C (versus -55°C for the BZ-3R) and has 1,000,000 mechanical life cycles (versus 20,000,000). Substitution is valid only when the application does not require extended low-temperature operation or high mechanical cycle counts.

Q: What is the primary difference between the Z-15E and Z-15G55?

A: Both parts maintain 15A AC current and 20,000,000 mechanical life is achieved only by the Z-15G55. The Z-15G55 provides IP62 ingress protection (sealed against water jets and dust) while the Z-15E provides IP00 (no protection). The Z-15E supports full 15A DC current; the Z-15G55 supports 6A DC. Select Z-15G55 for moisture-exposed environments; select Z-15E when DC current capacity must match AC capacity.

Q: Is the Honeywell BZ-3R suitable for applications below -25°C?

A: Yes. The BZ-3R operates from -55°C to 85°C. All three Omron substitutes operate only to -25°C or -15°C minimum. If the application requires operation below -25°C, the BZ-3R is the only suitable option among these parts.

Q: What does mechanical life versus electrical life represent?

A: Mechanical life measures the number of actuator cycles the switch can perform regardless of electrical load. Electrical life measures the number of cycles under specified electrical load conditions. The BZ-3R specifies 20,000,000 mechanical cycles; electrical life is not specified. The A-20G and Z-15G55 specify both 1,000,000 and 500,000 mechanical cycles respectively, with 500,000 electrical cycles each. The Z-15E specifies 300,000 mechanical cycles and 100,000 electrical cycles.

Q: Are all substitute parts RoHS compliant?

A: The BZ-3R and Z-15E are RoHS compliant. The A-20G and Z-15G55 are ROHS3 compliant, which represents a more recent RoHS standard revision. Both compliance levels are acceptable for most applications; verify specific procurement requirements if RoHS revision level is specified.

Q: What is the significance of IP62 ingress protection on the Z-15G55?

A: IP62 rating indicates protection against water jets (from any direction) and dust ingress. The BZ-3R and other substitutes do not specify ingress protection (effectively IP00). Select the Z-15G55 for applications with washdown environments, high humidity, or significant dust exposure.

Q: Can I use the A-20G if my application only requires 10A AC?

A: Yes. The A-20G is rated for 20A AC, so 10A operation is within specification. However, verify that the narrower operating temperature range (-25°C to 80°C) and lower mechanical life (1,000,000 cycles) are acceptable for your application before substitution.