Honeywell 1HM19 Snap Action Switch SPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 1HM19 is an SPDT (Single Pole Double Throw) snap action switch designed for chassis mount applications with a straight lever actuator. This hermetically sealed switch operates at 4A (AC/DC) with voltage ratings of 115V AC and 28V DC, featuring on-momentary switching function. The component is classified as Active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when inventory constraints, application-specific requirements, or design modifications necessitate alternative component selection while maintaining functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

1HM19

Honeywell Sensing and Productivity SolutionsIn Stock: 9401HM19 Datasheet

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DC1C-A1LB

ZF ElectronicsIn Stock: 670DC1C-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

Substitute parts for the Honeywell 1HM19 are qualified based on the following criteria:

Common Functional Parameters:

• Circuit configuration: SPDT (Single Pole Double Throw)
• Switch function: On-Mom (On-Momentary)
• Actuator type: Lever, Straight
• Mounting type: Chassis Mount
• Termination style: Solder Lug
• Compliance: RoHS compliant variants
• MSL rating: 1 (Unlimited)

Electrical Parameter Compatibility: Substitute parts must maintain SPDT circuit topology and on-momentary switching function. Voltage and current ratings may vary based on application requirements, provided the substitute meets or exceeds the minimum electrical specifications for the intended circuit.

Mechanical Parameter Compatibility: All substitute parts feature identical actuator and mounting configurations (lever straight actuator, chassis mount), ensuring mechanical interchangeability in standard switch mounting applications.

Identified Substitute Parts:

• DC1C-A1LB (ZF Electronics)
• DC2C-A1LB (ZF Electronics)
• DC3C-A1LB (ZF Electronics)

Parameter Comparison

Engineering Selection Recommendations

DC1C-A1LB Selection Criteria: The DC1C-A1LB (ZF Electronics) provides 5A AC current capacity with 125V AC rating, exceeding the 1HM19 AC specifications. DC current rating is reduced to 1A compared to the 1HM19's 4A DC rating, with DC voltage increased to 48V. This substitute is suitable for AC-dominant applications where DC current requirements do not exceed 1A. Operating temperature range is narrower (-40°C to 120°C versus -65°C to 121°C). Electrical life is reduced to 6,000 cycles, but mechanical life extends to 1,000,000 cycles. IP67 ingress protection is provided. ROHS3 compliance is maintained.

DC2C-A1LB Selection Criteria: The DC2C-A1LB (ZF Electronics) delivers 10A AC current capacity at 125V AC, providing significant current headroom for AC applications. DC specifications are not provided. This substitute is applicable to high-current AC switching applications. Operating temperature and electrical life parameters match DC1C-A1LB specifications. Mechanical life reaches 1,000,000 cycles. IP67 ingress protection is included. ROHS3 compliance is confirmed.

DC3C-A1LB Selection Criteria: The DC3C-A1LB (ZF Electronics) is rated for 100mA AC at 125V AC, representing a reduced current capacity suitable for low-power signal switching applications. This substitute provides extended electrical life of 100,000 cycles compared to the 1HM19's 25,000 cycles. Mechanical life extends to 1,000,000 cycles. IP67 ingress protection is provided. ROHS3 compliance and REACH unaffected status are confirmed. Operating temperature range is -40°C to 120°C.

Compliance and Status: All substitute parts maintain Active product status and RoHS compliance (ROHS3 variant). MSL rating remains at Level 1 (Unlimited) across all alternatives. ECCN classification (EAR99) and HTSUS code (8536.50.7000) are consistent across all parts.

Frequently Asked Questions (FAQ)

Q: Can DC1C-A1LB replace 1HM19 in all applications?

A: DC1C-A1LB is functionally compatible for SPDT on-momentary switching with chassis mount configuration. However, DC current capacity is limited to 1A (versus 1HM19's 4A DC), and operating temperature minimum is -40°C (versus 1HM19's -65°C). Electrical life is reduced to 6,000 cycles. Substitution is valid only when DC current does not exceed 1A and operating temperature remains above -40°C.

Q: What is the primary difference between DC2C-A1LB and DC1C-A1LB?

A: DC2C-A1LB provides 10A AC current capacity compared to DC1C-A1LB's 5A AC rating. Both maintain identical mechanical life (1,000,000 cycles), operating temperature range (-40°C to 120°C), and electrical life (6,000 cycles). DC2C-A1LB is selected for applications requiring higher AC current switching.

Q: When should DC3C-A1LB be selected?

A: DC3C-A1LB is specified for low-power signal switching applications with 100mA AC maximum current. This part provides extended electrical life (100,000 cycles) and is not suitable for applications requiring 4A switching capacity. Selection is appropriate for control circuits and signal-level switching where current does not exceed 100mA.

Q: Are all substitute parts IP67 rated?

A: Yes. DC1C-A1LB, DC2C-A1LB, and DC3C-A1LB all feature IP67 ingress protection (dust tight, waterproof), whereas the 1HM19 ingress protection specification is not provided. This represents an enhancement in environmental sealing for substitute parts.

Q: What is the impact of reduced electrical life in ZF Electronics substitutes?

A: DC1C-A1LB and DC2C-A1LB provide 6,000 electrical cycles compared to 1HM19's 25,000 cycles. DC3C-A1LB provides 100,000 cycles. Electrical life reduction in DC1C-A1LB and DC2C-A1LB may impact applications with high switching frequency. Mechanical life extends to 1,000,000 cycles across all ZF substitutes, indicating superior mechanical durability.

Q: Are RoHS compliance levels equivalent between 1HM19 and substitute parts?

A: 1HM19 is RoHS Compliant (standard RoHS). Substitute parts are ROHS3 Compliant, representing a more recent compliance standard. ROHS3 compliance includes additional substance restrictions and is backward compatible with RoHS requirements.

Q: Can substitute parts be used in temperature-critical applications below -40°C?

A: No. All ZF Electronics substitutes (DC1C-A1LB, DC2C-A1LB, DC3C-A1LB) operate from -40°C minimum, whereas 1HM19 operates from -65°C. Applications requiring operation below -40°C must retain the 1HM19 or identify alternative parts with extended low-temperature ratings.

Q: What packaging options are available?

A: 1HM19 is supplied in Bulk packaging. DC1C-A1LB and DC3C-A1LB are supplied in Bulk packaging. DC2C-A1LB packaging is not specified in available data. Confirm packaging requirements with supplier documentation.