Honeywell BZ-7RT04 Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell BZ-7RT04 is an SPDT snap action switch rated for 15A AC at 125V with a round pin plunger actuator and chassis mount configuration. This switch is designed for applications requiring reliable on-momentary switching with a mechanical life of 20,000,000 cycles. The part is currently active in production with RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and circuit function can be maintained within the allowed parameter ranges for snap action switch applications. Substitution becomes necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the broader parameter envelope of alternative manufacturers' offerings.

Key Parameters

Parameter	BZ-7RT04 (Main Part)	Specification Range
Circuit Configuration	SPDT	Single Pole Double Throw
Switch Function	On-Mom	On-Momentary
Current Rating (AC)	15A	125V AC
Current Rating (DC)	500mA	125V DC
Actuator Type	Round (Pin Plunger)	Chassis Mount
Termination Style	Screw Terminal	Fixed Connection
Operating Temperature	-55°C to 85°C	Environmental Range
Mechanical Life	20,000,000 Cycles	Durability Rating
RoHS Status	RoHS Compliant	Regulatory Compliance

Substitute Part Grouping Explanation

Substitution logic for the Honeywell BZ-7RT04 is based on the following criteria derived from the provided parameters:

Primary Substitution Criteria:

Circuit configuration must be SPDT
Switch function must be On-Mom
Voltage rating must support 125V AC minimum
Actuator type must be round pin plunger
Mounting type must be chassis mount
Termination style must be screw terminal

Secondary Compatibility Parameters:

Current rating (AC) of 15A or higher
Mechanical life of 20,000,000 cycles or higher
Operating temperature range that encompasses or overlaps with -55°C to 85°C
RoHS compliance status

Substitute Parts Identified:

Group 1 - Direct Current Rating Match (15A AC):

Z-15GD-B7-K (Omron)
Z-15GD55-B7-K (Omron)
Z-15GS55-B7-K (Omron)

Group 2 - Higher Current Rating (20A AC):

A-20GD-B7-K (Omron)

Group 3 - Lower Current Rating (10A AC):

Z-15H2-B (Omron)

Parameter Comparison

Parameter	BZ-7RT04	A-20GD-B7-K	Z-15GD-B7-K	Z-15GD55-B7-K	Z-15GS55-B7-K	Z-15H2-B
Manufacturer	Honeywell	Omron	Omron	Omron	Omron	Omron
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom
Current Rating (AC)	15A	20A	15A	15A	15A	10A
Current Rating (DC)	500mA	6A	6A	6A	6A	2A
Voltage Rating (AC)	125V	125V	125V	125V	125V	125V
Voltage Rating (DC)	125V	30V	30V	30V	30V	30V
Actuator Type	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
Operating Temperature	-55°C to 85°C	-25°C to 80°C	-25°C to 80°C	-15°C to 80°C	-15°C to 80°C	-25°C to 80°C
Mechanical Life	20,000,000	1,000,000	20,000,000	20,000,000	20,000,000	20,000,000
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Ingress Protection	Not specified	IP00	IP00	IP62	IP62	IP00

Engineering Selection Recommendations

Direct Substitutes (Equivalent Current Rating):

The Omron Z-15GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K are functionally equivalent to the BZ-7RT04 for 15A AC applications. All three maintain SPDT circuit configuration, on-momentary function, 125V AC rating, round pin plunger actuation, chassis mount, and screw terminal termination. All substitute parts achieve 20,000,000 mechanical life cycles matching the main part specification.

Compliance Considerations:

The Z-15GD-B7-K and Z-15GS55-B7-K carry RoHS Compliant status. The Z-15GD55-B7-K also carries RoHS Compliant status. The Z-15H2-B and Z-15GD-B7-K carry ROHS3 Compliant status, which represents an enhanced compliance level. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Temperature Range Limitations:

The BZ-7RT04 operates across -55°C to 85°C. All Omron substitute parts operate within -25°C to -15°C minimum temperatures, which represents a narrower low-temperature range. Applications requiring operation below -25°C cannot use these substitutes without design review.

DC Voltage Consideration:

The BZ-7RT04 supports 125V DC operation. All Omron substitutes are rated for 30V DC maximum. Applications requiring 125V DC operation cannot use these substitutes.

Higher Current Rating Option:

The Omron A-20GD-B7-K provides 20A AC rating, exceeding the 15A requirement. This part is suitable for applications where higher current capacity is beneficial. However, mechanical life is rated at 1,000,000 cycles, significantly lower than the 20,000,000 cycle specification of the main part and other substitutes.

Lower Current Rating Option:

The Omron Z-15H2-B is rated for 10A AC, below the 15A specification. This part is suitable only for applications with current requirements not exceeding 10A AC.

Ingress Protection:

The Z-15GD55-B7-K and Z-15GS55-B7-K provide IP62 ingress protection, suitable for applications requiring moisture and dust resistance. The Z-15GD-B7-K, A-20GD-B7-K, and Z-15H2-B provide IP00 (no ingress protection).

Frequently Asked Questions (FAQ)

Q: Can the Omron Z-15GD-B7-K directly replace the Honeywell BZ-7RT04?

A: The Z-15GD-B7-K is functionally compatible for 15A AC applications at 125V. Both parts share identical circuit configuration (SPDT), switch function (On-Mom), actuator type (round pin plunger), mounting (chassis mount), termination (screw terminal), and mechanical life (20,000,000 cycles). However, the Z-15GD-B7-K operates at -25°C minimum temperature versus -55°C for the BZ-7RT04, and supports 30V DC maximum versus 125V DC for the main part. Substitution is valid only when these parameter differences do not conflict with application requirements.

Q: What is the difference between Z-15GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K?

A: All three parts are rated for 15A AC at 125V with identical circuit, function, actuator, mounting, and termination. The Z-15GD55-B7-K and Z-15GS55-B7-K provide IP62 ingress protection compared to IP00 for the Z-15GD-B7-K. The Z-15GD55-B7-K has a fixed operating force of 540gf, while Z-15GS55-B7-K has a variable operating force range of 250-350gf. The Z-15GS55-B7-K has a longer operating position of 1.110" (28.2mm) compared to 0.846" (21.5mm) for the other two parts.

Q: Why does the A-20GD-B7-K have lower mechanical life than other substitutes?

A: The A-20GD-B7-K is rated for 20A AC current, which is higher than the 15A specification of the main part. Higher current capacity typically results in different mechanical design parameters. This part is rated for 1,000,000 mechanical cycles versus 20,000,000 cycles for the BZ-7RT04 and other 15A-rated substitutes. Applications requiring extended mechanical life should not use the A-20GD-B7-K.

Q: Can the Z-15H2-B be used in place of the BZ-7RT04?

A: The Z-15H2-B is rated for 10A AC, which is below the 15A AC specification of the BZ-7RT04. This part is suitable only for applications where the actual current requirement does not exceed 10A AC. If the application requires 15A AC capability, the Z-15H2-B is not an appropriate substitute.

Q: What are the DC voltage limitations of the Omron substitutes?

A: All Omron substitute parts (A-20GD-B7-K, Z-15GD-B7-K, Z-15GD55-B7-K, Z-15GS55-B7-K, Z-15H2-B) are rated for 30V DC maximum. The BZ-7RT04 supports 125V DC operation. Applications requiring 125V DC operation cannot use any of these Omron substitutes. The DC current ratings also vary: A-20GD-B7-K and Z-series GD/GS parts support 6A DC, while Z-15H2-B supports 2A DC, compared to 500mA DC for the main part.

Q: Are all substitute parts RoHS compliant?

A: Yes. The Z-15GD-B7-K and Z-15H2-B carry ROHS3 Compliant status. The A-20GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K carry RoHS Compliant status. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating. ROHS3 represents an enhanced compliance level beyond standard RoHS requirements.

Q: Which substitute part should be selected for applications requiring moisture resistance?

A: The Z-15GD55-B7-K and Z-15GS55-B7-K both provide IP62 ingress protection, suitable for applications requiring moisture and dust resistance. Both parts maintain 15A AC rating at 125V, 20,000,000 mechanical life cycles, and RoHS compliance. The Z-15GD55-B7-K has a fixed operating force of 540gf, while the Z-15GS55-B7-K has a variable operating force range of 250-350gf. Selection between these two depends on specific actuator force requirements.

Q: What is the impact of the narrower operating temperature range of substitute parts?

A: The BZ-7RT04 operates from -55°C to 85°C. All Omron substitutes operate from -25°C to -15°C minimum temperature. Applications requiring operation below -25°C cannot use these substitutes without design modification or alternative component selection. Applications operating within -25°C to 85°C range are compatible with all substitute parts.

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