BZ-7R55T-S Equivalent & Substitute Parts Reference

Part Overview

The BZ-7R55T-S 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 15A AC at 125V with a round pin plunger actuator and screw terminal connections. The switch operates with an on-momentary function and provides splash proof ingress protection. Finding equivalent or substitute parts may be necessary due to inventory constraints, application-specific requirements, or design optimization needs.

Substiute Parts

BZ-7R55T-S

Honeywell Sensing and Productivity SolutionsIn Stock: 1049BZ-7R55T-S Datasheet

Current PartRFQ

TZ-1G

Omron Automation and SafetyIn Stock: 1058TZ-1G Datasheet

SimilarRFQ

Z-15H2-B

Omron Automation and SafetyIn Stock: 1146Z-15H2-B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-7R55T-S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Mom
• Actuator type must be Round (Pin Plunger)
• Mounting type must be Chassis Mount
• Termination style must be Screw Terminal
• Operating position must be 0.625" (15.9mm)

Electrical Compatibility Criteria:

• AC voltage rating must be 125V minimum
• Current rating must support the application load (15A AC for the main part)
• DC voltage and current ratings must meet or exceed application requirements

Environmental & Mechanical Criteria:

• Operating temperature range must encompass the application environment
• Mechanical life must support the duty cycle requirements
• Ingress protection rating must be adequate for the installation environment

The substitute parts identified (Z-15H2-B and TZ-1G) share the core mechanical and electrical interface characteristics with the BZ-7R55T-S. However, electrical performance differences exist and must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Z-15H2-B (Omron Automation and Safety):

The Z-15H2-B is an active-status substitute with mechanical and interface compatibility to the BZ-7R55T-S. This part maintains the same SPDT circuit, on-momentary function, round pin plunger actuator, chassis mount configuration, and 0.625" operating position. The Z-15H2-B is rated for 10A AC at 125V, which is lower than the BZ-7R55T-S 15A AC rating. The DC voltage rating is 30V compared to 125V on the main part. The Z-15H2-B operates across -25°C to 80°C, which is narrower than the BZ-7R55T-S range of -55°C to 85°C. Both parts share identical 20,000,000 cycle mechanical life ratings. The Z-15H2-B carries ROHS3 compliance and is REACH Affected. Selection of this substitute requires confirmation that the 10A AC current rating and 30V DC voltage rating are adequate for the application.

TZ-1G (Omron Automation and Safety):

The TZ-1G is an active-status substitute with mechanical and interface compatibility to the BZ-7R55T-S. This part maintains the same SPDT circuit, on-momentary function, round pin plunger actuator, chassis mount configuration, and 0.625" operating position. The TZ-1G is rated for 1A AC/DC at 125V AC and 30V DC, which represents significantly lower current and DC voltage ratings compared to the BZ-7R55T-S. The TZ-1G operates across -65°C to 400°C, providing an extended upper temperature range. The mechanical life rating is 100,000 cycles, substantially lower than the BZ-7R55T-S 20,000,000 cycles. The TZ-1G carries ROHS3 compliance and is REACH Unaffected. Selection of this substitute requires confirmation that the 1A current rating, 30V DC voltage rating, and 100,000 cycle mechanical life are appropriate for the application.

Frequently Asked Questions (FAQ)

Q: Can the Z-15H2-B directly replace the BZ-7R55T-S in all applications?

A: The Z-15H2-B shares the same mechanical interface and SPDT on-momentary function as the BZ-7R55T-S. However, the Z-15H2-B current rating is 10A AC versus 15A AC on the main part, and the DC voltage rating is 30V versus 125V. Substitution is valid only when the application current requirement does not exceed 10A AC and the DC voltage requirement does not exceed 30V.

Q: What are the key differences between the Z-15H2-B and TZ-1G substitutes?

A: The Z-15H2-B is rated for 10A AC at 125V AC with 20,000,000 cycle mechanical life and operates from -25°C to 80°C. The TZ-1G is rated for 1A AC/DC at 125V AC and 30V DC with 100,000 cycle mechanical life and operates from -65°C to 400°C. The Z-15H2-B is suitable for higher current applications, while the TZ-1G is suitable for lower current applications with extended temperature range capability.

Q: Why does the BZ-7R55T-S have a higher DC voltage rating than the substitute parts?

A: The BZ-7R55T-S is rated for 125V DC, while both substitute parts (Z-15H2-B and TZ-1G) are rated for 30V DC. This difference reflects the design specifications of each manufacturer's product line. Applications requiring 125V DC operation must use the BZ-7R55T-S or confirm that the substitute part's 30V DC rating is adequate.

Q: Are there ingress protection differences between the main part and substitutes?

A: The BZ-7R55T-S is rated as Splash Proof, while both substitute parts (Z-15H2-B and TZ-1G) are rated as IP00. The Splash Proof rating on the main part provides greater environmental protection. Applications requiring splash proof protection should retain the BZ-7R55T-S or evaluate whether IP00 protection is adequate for the installation environment.

Q: What is the significance of the mechanical life ratings?

A: The BZ-7R55T-S and Z-15H2-B both provide 20,000,000 cycle mechanical life, while the TZ-1G provides 100,000 cycles. For applications with high duty cycle requirements, the BZ-7R55T-S or Z-15H2-B are appropriate. The TZ-1G is suitable for lower duty cycle applications.

Q: Do all three parts have the same operating position?

A: Yes. The BZ-7R55T-S, Z-15H2-B, and TZ-1G all have an operating position of 0.625" (15.9mm), ensuring mechanical compatibility in chassis mount installations.

Q: What compliance certifications should I verify for my application?

A: The BZ-7R55T-S is RoHS Compliant. The Z-15H2-B and TZ-1G are ROHS3 Compliant. The Z-15H2-B is REACH Affected, while the TZ-1G is REACH Unaffected. Verify that the selected part meets your application's regulatory requirements.