Honeywell 311SM95 Snap Action Switch SPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 311SM95 is a snap action switch with Single Pole Double Throw (SPDT) circuit configuration, rated for 5A at 250V AC and 30V DC. This component features a lever with simulated roller actuator and chassis mount termination via solder lugs. The 311SM95 is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain SPDT circuit topology, 5A current rating, and chassis mount configuration while accommodating operational parameter variations.

Substiute Parts

311SM95

Honeywell Sensing and Productivity SolutionsIn Stock: 725311SM95 Datasheet

Current PartRFQ

MS0850500F060S1A

E-SwitchIn Stock: 1035MS0850500F060S1A Datasheet

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MS0850500F250S1A

E-SwitchIn Stock: 1435MS0850500F250S1A Datasheet

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MS0850500F295S1A

E-SwitchIn Stock: 732MS0850500F295S1A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the Honeywell 311SM95 is based on the following mandatory electrical and mechanical parameters:

Primary Substitution Criteria:

• Circuit configuration: SPDT maintained across all substitutes
• Current rating: 5A (AC) minimum required
• Mounting type: Chassis mount required
• Termination style: Solder lug required
• Switch function: On-Momentary operation required

Secondary Compatibility Parameters:

• Voltage rating: Substitute parts operate at 125V AC, which is lower than the original 250V AC rating. This represents a voltage derating and restricts use to applications not exceeding 125V AC.
• Actuator type: Substitute parts use round pin plunger actuators, differing from the original lever with simulated roller design. This affects mechanical interface and actuation force characteristics.
• Operating force: Varies across substitute models (60gf, 250gf, 295gf) compared to original 45gf, requiring force profile evaluation for specific applications.
• Operating temperature: Substitute parts operate within -25°C to 85°C range, narrower than the original -55°C to 125°C specification.
• Mechanical life: Substitute parts rated for 1,000,000 cycles, significantly lower than the original 10,000,000 cycle rating.

All substitute parts are manufactured by E-Switch and carry active product status with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The Honeywell 311SM95 is classified as obsolete. All three E-Switch substitute models (MS0850500F060S1A, MS0850500F250S1A, MS0850500F295S1A) maintain active product status, ensuring ongoing availability and manufacturing support.

Compliance and Certification: All substitute parts carry ROHS3 compliance certification, meeting current regulatory requirements. The original 311SM95 carries RoHS Compliant status. Both compliance levels are acceptable for applications requiring RoHS adherence.

Voltage Rating Derating: Substitute parts operate at 125V AC maximum, representing a 50% reduction from the original 250V AC rating. Selection of E-Switch alternatives is restricted to applications operating at or below 125V AC. Applications requiring 250V AC operation cannot use these substitutes.

Actuator and Force Profile Differences: The original 311SM95 features a lever with simulated roller actuator requiring 45gf operating force. E-Switch substitutes employ round pin plunger actuators with three force variants: 60gf, 250gf, and 295gf. Mechanical interface compatibility and actuation force requirements must be evaluated for specific applications.

Operating Temperature Range: Substitute parts operate within -25°C to 85°C, compared to the original -55°C to 125°C range. Applications requiring operation below -25°C or above 85°C cannot use these substitutes.

Mechanical Life Rating: Substitute parts are rated for 1,000,000 mechanical cycles versus the original 10,000,000 cycle rating. Applications requiring extended cycle life must account for this tenfold reduction in mechanical life specification.

Selection by Operating Force:

• MS0850500F060S1A: 60gf operating force, closest to original 45gf specification
• MS0850500F250S1A: 250gf operating force, moderate force requirement
• MS0850500F295S1A: 295gf operating force, highest force requirement

Frequently Asked Questions (FAQ)

Q: Can the E-Switch MS0850500 series parts directly replace the Honeywell 311SM95 in all applications?

A: No. While all substitute parts maintain SPDT circuit configuration, 5A current rating, chassis mount, and solder lug termination, critical parameter differences exist. Voltage rating is reduced to 125V AC, operating temperature range is narrowed to -25°C to 85°C, mechanical life is reduced to 1,000,000 cycles, and actuator type differs from lever to round pin plunger. Substitution is valid only for applications compatible with these parameter changes.

Q: What is the primary difference between the three E-Switch substitute models?

A: The three E-Switch models differ exclusively in operating force specification: MS0850500F060S1A requires 60gf, MS0850500F250S1A requires 250gf, and MS0850500F295S1A requires 295gf. All other electrical and mechanical parameters are identical across the three models. Selection depends on the actuation force requirement of the specific application.

Q: Is the voltage rating reduction from 250V AC to 125V AC a critical limitation?

A: The voltage rating reduction is application-dependent. For circuits operating at or below 125V AC, the E-Switch substitutes are electrically suitable. For applications requiring 250V AC operation, these substitutes cannot be used. Verify the maximum operating voltage of the target application before selection.

Q: How does the change from lever actuator to round pin plunger affect compatibility?

A: The actuator type change affects mechanical interface design. The original lever with simulated roller provides a different engagement profile than the round pin plunger design. Mechanical mounting, actuation geometry, and force application points may require redesign. Physical evaluation of the mechanical interface is necessary to confirm compatibility.

Q: Are the E-Switch substitutes suitable for high-cycle applications?

A: The E-Switch substitutes are rated for 1,000,000 mechanical cycles, compared to the original 10,000,000 cycle rating. For applications requiring extended cycle life beyond 1,000,000 cycles, these substitutes may not meet durability requirements. Evaluate the specific cycle life requirement against the 1,000,000 cycle specification.

Q: What is the inventory status of these substitute parts?

A: MS0850500F060S1A: 997 pieces in stock; MS0850500F250S1A: 1,404 pieces in stock; MS0850500F295S1A: 704 pieces in stock. All substitute parts are available in bulk packaging.

Q: Do the E-Switch substitutes support DC voltage operation?

A: The E-Switch substitute specifications list only AC voltage ratings (125V AC). DC voltage ratings are not specified for these models. If DC operation is required, contact the manufacturer for DC voltage capability confirmation.