Honeywell 19HM4 SPDT Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The Honeywell 19HM4 is a snap action SPDT (Single Pole Double Throw) switch rated for 0.5A DC at 28V with panel mount configuration and solder lug termination. This switch is designed for On-Momentary operation with a lever straight actuator and operates across a temperature range of -65°C to 121°C. The part is currently active in production with 1,103 pieces available in new original stock.

Equivalent and substitute parts are identified when alternative manufacturers offer SPDT snap action switches with compatible electrical ratings, mechanical characteristics, and mounting configurations that satisfy the same application requirements. The substitute parts listed below provide functional alternatives with varying current and voltage ratings suitable for different circuit implementations.

Substiute Parts

19HM4

Honeywell Sensing and Productivity SolutionsIn Stock: 115419HM4 Datasheet

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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 of the Honeywell 19HM4 snap action switch is determined by compatibility across the following critical parameters:

Circuit Configuration: All substitute parts maintain SPDT circuit topology, ensuring identical switching logic and contact arrangement.

Switch Function: All alternatives operate in On-Momentary mode, matching the momentary contact behavior of the original part.

Actuator Type: All substitutes feature lever straight actuators, maintaining mechanical interface consistency.

Termination Style: All alternatives use solder lug termination, ensuring compatibility with existing PCB or chassis connections.

Electrical Ratings: Substitute parts are grouped by their current and voltage capabilities. The 19HM4 operates at 500mA DC / 28V DC. Substitute parts may operate at higher AC ratings (125V AC) or different DC ratings (48V DC), but all maintain SPDT functionality and solder lug termination.

Mounting Configuration: The 19HM4 uses panel mount; substitute parts use chassis mount, representing a mechanical interface difference that must be evaluated for application fit.

Environmental Compliance: Substitute parts from ZF Electronics are ROHS3 compliant, whereas the 19HM4 is RoHS non-compliant. All parts maintain MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

DB1C-A1LB Substitution: This ZF Electronics part maintains SPDT configuration with On-Momentary operation and solder lug termination. It supports 1A DC at 48V and 5A AC at 125V, exceeding the 19HM4 DC rating. The DB1C-A1LB is ROHS3 compliant and rated for 6,000 electrical cycles and 15,000,000 mechanical cycles. Mounting configuration differs (chassis mount vs. panel mount), requiring mechanical interface evaluation. Operating temperature range is -40°C to 120°C, which does not extend to the -65°C lower limit of the 19HM4. This part is suitable for applications where higher current capacity and RoHS compliance are required.

DC2C-A1LB Substitution: This ZF Electronics part provides SPDT On-Momentary switching with 10A AC at 125V rating. It features IP67 ingress protection and ROHS3 compliance. The DC2C-A1LB is rated for 6,000 electrical cycles and 1,000,000 mechanical cycles. Like the DB1C-A1LB, it uses chassis mount configuration and operates from -40°C to 120°C. This part is appropriate for higher current AC applications requiring enhanced environmental protection.

DC3C-A1LB Substitution: This ZF Electronics part maintains SPDT On-Momentary configuration with 100mA AC at 125V rating. It provides IP67 ingress protection and ROHS3 compliance with 100,000 electrical cycles and 1,000,000 mechanical cycles. Operating temperature range is -40°C to 120°C. The DC3C-A1LB is suitable for low-current AC applications requiring environmental sealing and regulatory compliance.

All substitute parts are active products with confirmed inventory availability. Selection should be based on specific circuit voltage and current requirements, mounting interface compatibility, and environmental compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can the DB1C-A1LB directly replace the 19HM4 in a 28V DC circuit?

A: The DB1C-A1LB is rated for 48V DC at 1A, which exceeds the 19HM4 specification of 28V DC at 500mA. However, the mounting configuration differs (chassis mount vs. panel mount), requiring mechanical interface verification. The operating temperature range of the DB1C-A1LB (-40°C to 120°C) does not extend to the -65°C lower limit of the 19HM4.

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

A: The three ZF substitutes differ primarily in current rating and ingress protection. The DB1C-A1LB supports 5A AC / 1A DC with IP50 protection. The DC2C-A1LB supports 10A AC with IP67 protection. The DC3C-A1LB supports 100mA AC with IP67 protection. All maintain SPDT On-Momentary operation with solder lug termination.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three ZF Electronics substitute parts (DB1C-A1LB, DC2C-A1LB, DC3C-A1LB) are ROHS3 compliant. The original 19HM4 is RoHS non-compliant.

Q: Does mounting type affect electrical performance?

A: Mounting type (panel mount vs. chassis mount) affects mechanical installation and physical interface but does not alter electrical switching characteristics. Both configurations use solder lug termination and maintain identical SPDT circuit topology.

Q: Which substitute part is most similar to the 19HM4 in terms of operating force?

A: The DC3C-A1LB has an operating force of 82gf, which is closer to the 19HM4 specification of 198gf compared to the DB1C-A1LB (60gf) and DC2C-A1LB (153gf). However, all three substitutes operate within acceptable snap action switch force ranges for lever actuators.

Q: Can these parts be used interchangeably in AC applications?

A: The 19HM4 is specified for DC operation only (28V DC, 500mA). The ZF substitutes are rated for AC operation (125V AC). These parts are not interchangeable for AC/DC applications without circuit redesign and voltage/current verification.

Q: What inventory levels are available for each part?

A: The 19HM4 has 1,103 pieces in stock. DB1C-A1LB has 22,513 pieces. DC2C-A1LB has 989 pieces. DC3C-A1LB has 14,397 pieces. All parts are listed as active products.