Honeywell 3HM1 SPDT Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The Honeywell 3HM1 is an SPDT (Single Pole Double Throw) snap action switch designed for chassis mount applications with a 1A DC rating at 28V. This switch features a straight lever actuator and solder lug termination, suitable for applications requiring reliable on-momentary switching action. The part is currently active in production with RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified for applications where higher current ratings, extended voltage ranges, or enhanced environmental protection are required while maintaining core SPDT switching functionality and mechanical compatibility.

Substiute Parts

3HM1

Honeywell Sensing and Productivity SolutionsIn Stock: 7623HM1 Datasheet

Current PartRFQ

DB1C-A1LB

ZF ElectronicsIn Stock: 22554DB1C-A1LB Datasheet

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DC2C-A1LB

ZF ElectronicsIn Stock: 1055DC2C-A1LB Datasheet

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DC3C-A1LB

ZF ElectronicsIn Stock: 14413DC3C-A1LB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Honeywell 3HM1 is determined by the following mandatory parameters:

Core Compatibility Requirements:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Actuator type must be Lever, Straight
• Mounting type must be Chassis Mount
• Termination style must be Solder Lug
• MSL rating must be 1 (Unlimited)

Substitution Logic:

The three identified substitute parts (DB1C-A1LB, DC2C-A1LB, DC3C-A1LB) from ZF Electronics meet all core compatibility requirements. These substitutes are grouped based on their electrical ratings:

• DB1C-A1LB: Rated for 5A AC / 1A DC at 125V AC / 48V DC. Provides equivalent DC current capacity (1A) with extended voltage capability and AC rating support.

• DC2C-A1LB: Rated for 10A AC at 125V AC. Offers higher current capacity for AC applications with enhanced environmental protection (IP67).

• DC3C-A1LB: Rated for 100mA AC at 125V AC. Provides lower current capacity suitable for signal-level switching applications with enhanced environmental protection (IP67).

All substitutes maintain SPDT circuit configuration, on-momentary function, lever straight actuator, chassis mount design, solder lug termination, and MSL 1 rating. Substitution selection depends on the specific current and voltage requirements of the target application.

Parameter Comparison

Engineering Selection Recommendations

Product Status Compliance: All identified substitute parts (DB1C-A1LB, DC2C-A1LB, DC3C-A1LB) maintain active product status with current manufacturing availability. The Honeywell 3HM1 is also active in production.

Regulatory Compliance: The Honeywell 3HM1 carries RoHS Compliant certification. All three ZF Electronics substitutes carry ROHS3 Compliant certification, representing an equivalent or enhanced compliance posture. All parts are classified under ECCN EAR99 and HTSUS 8536.50.7000.

Moisture Sensitivity: All parts maintain MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints for storage, handling, or assembly processes.

Selection Criteria Based on Application Requirements:

• For DC applications at 28V with 1A current: DB1C-A1LB provides direct electrical equivalence with extended voltage margin (48V DC rating) and AC capability support.

• For AC applications requiring higher current capacity: DC2C-A1LB (10A AC) or DB1C-A1LB (5A AC) provide enhanced current handling with IP50 or IP67 environmental protection.

• For signal-level AC switching: DC3C-A1LB accommodates 100mA AC applications with IP67 environmental protection.

Mechanical Considerations: Operating position differs between the main part (0.330" / 8.4mm) and all substitutes (0.420" / 10.7mm). Operating force also varies significantly (198gf for 3HM1 versus 60-153gf for substitutes). These mechanical differences require verification of mechanical fit and actuation force compatibility within the target application enclosure and user interface design.

Frequently Asked Questions (FAQ)

Q: Can DB1C-A1LB directly replace the Honeywell 3HM1 in a 28V DC circuit?

A: DB1C-A1LB is electrically compatible for 28V DC operation, as it is rated for 1A DC at 48V DC. However, the operating position is 0.330" (8.4mm) for the 3HM1 versus 0.420" (10.7mm) for DB1C-A1LB, and the operating force differs (198gf versus 60gf). Mechanical fit and actuation force requirements must be evaluated for the specific application.

Q: What is the difference between the three ZF Electronics substitutes?

A: The three substitutes differ primarily in current rating and environmental protection. DB1C-A1LB is rated for 5A AC / 1A DC with IP50 protection. DC2C-A1LB is rated for 10A AC with IP67 protection. DC3C-A1LB is rated for 100mA AC with IP67 protection. All maintain SPDT configuration and on-momentary function.

Q: Are all substitutes RoHS compliant?

A: Yes. The Honeywell 3HM1 is RoHS Compliant. All three ZF Electronics substitutes (DB1C-A1LB, DC2C-A1LB, DC3C-A1LB) are ROHS3 Compliant, representing equivalent or enhanced environmental compliance.

Q: What is the significance of the operating position difference?

A: The Honeywell 3HM1 has an operating position of 0.330" (8.4mm), while all ZF substitutes have 0.420" (10.7mm). This difference affects the mechanical travel distance required to actuate the switch. Applications with space constraints or specific mechanical linkage designs must account for this variation.

Q: Can these switches be used in AC applications?

A: The Honeywell 3HM1 is specified for DC operation only (1A at 28V DC). The ZF Electronics substitutes support AC operation: DB1C-A1LB (5A AC at 125V), DC2C-A1LB (10A AC at 125V), and DC3C-A1LB (100mA AC at 125V). AC application requirements determine which substitute is appropriate.

Q: What does MSL 1 (Unlimited) mean for these switches?

A: MSL 1 (Unlimited) indicates that the component has no moisture sensitivity constraints. These switches can be stored, handled, and assembled without special moisture control measures or baking procedures prior to soldering.

Q: Are the solder lug terminations identical across all parts?

A: All parts use solder lug termination style. However, physical dimensions and lug sizing may vary between manufacturers. Verification of lug compatibility with PCB pad layouts and wire gauge requirements is necessary before substitution.

Q: What is the operating temperature range for each part?

A: The Honeywell 3HM1 operates from -184°C to 121°C. All ZF Electronics substitutes operate from -40°C to 120°C. Applications requiring operation below -40°C must use the Honeywell 3HM1.

Q: How do the electrical life and mechanical life ratings compare?

A: The Honeywell 3HM1 does not specify electrical or mechanical life ratings in the provided data. ZF Electronics substitutes provide these specifications: DB1C-A1LB (6,000 electrical cycles / 15,000,000 mechanical cycles), DC2C-A1LB (6,000 electrical cycles / 1,000,000 mechanical cycles), DC3C-A1LB (100,000 electrical cycles / 1,000,000 mechanical cycles).