Equivalent & Substitute Parts for SL1-PK Snap Action Switch

Part Overview

The SL1-PK is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, configured as a single-pole double-throw (SPDT) device with on-momentary function. This component is rated for 100mA at 125V AC and 30V DC, featuring a round pin plunger actuator with chassis mount configuration and IP67 ingress protection. The SL1-PK is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where this functionality is required.

Substiute Parts

SL1-PK

Honeywell Sensing and Productivity SolutionsIn Stock: 1024SL1-PK Datasheet

Current PartRFQ

D4E-1G21N

Omron Automation and SafetyIn Stock: 741D4E-1G21N Datasheet

SimilarRFQ

D4E-2G21N

Omron Automation and SafetyIn Stock: 843D4E-2G21N Datasheet

SimilarRFQ

ZC-W255

Omron Automation and SafetyIn Stock: 828ZC-W255 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL1-PK snap action switch is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Circuit configuration must be SPDT
• Switch function must be on-momentary
• Voltage rating must support 125V AC minimum
• Current rating must equal or exceed 100mA
• Mounting type must be chassis mount
• Ingress protection must maintain IP67 classification
• Operating force and release force must match specified values (400gf and 80gf respectively)
• Operating position must be 0.909" (23.1mm)
• Pretravel must be 0.080" (2.0mm)
• Differential travel must be 0.012" (0.3mm)
• Overtravel must be 0.158" (4.0mm)
• Operating temperature range must encompass -10°C to 70°C minimum

Secondary Considerations:

• Termination style may vary (connector to cable leads or screw terminal acceptable)
• Actuator type may vary (round pin plunger to lever/roller acceptable)
• Product status preference for active components over obsolete
• RoHS compliance status

Three substitute parts meet these criteria with varying degrees of parameter alignment.

Parameter Comparison

Engineering Selection Recommendations

D4E-2G21N (Omron) - Primary Substitute

The D4E-2G21N represents the closest functional equivalent to the SL1-PK. This component maintains identical electrical ratings (100mA at 125V AC/30V DC), matching circuit configuration (SPDT), and all critical mechanical parameters including operating force, release force, operating position, pretravel, differential travel, and overtravel. The D4E-2G21N is classified as active product status, ensuring ongoing availability and manufacturer support. RoHS compliance is maintained. The primary difference is termination style (cable leads versus connector) and actuator type (lever/roller versus round pin plunger), which are acceptable variations for substitution purposes. Operating temperature range extends to 80°C, providing enhanced thermal margin. Mechanical life specification of 10,000,000 cycles is provided.

D4E-1G21N (Omron) - Secondary Substitute

The D4E-1G21N shares identical mechanical parameters with the SL1-PK and D4E-2G21N but features increased current rating of 5A (AC/DC). This component is suitable for applications where the SL1-PK current capacity is insufficient or where future current requirements may increase. All mechanical specifications align precisely with the main part. Active product status and ROHS3 compliance are confirmed. Electrical life specification of 500,000 cycles is provided. Termination style and actuator type differ from the main part but remain acceptable for substitution.

ZC-W255 (Omron) - Limited Substitute

The ZC-W255 provides substitution capability for applications where increased current handling is required (10A AC/6A DC). However, this component exhibits mechanical parameter deviations that restrict its use to applications where these differences are acceptable. Operating position is 1.693" (43.0mm) versus 0.909" (23.1mm) for the main part. Differential travel is 0.040" (1.0mm) versus 0.012" (0.3mm). Overtravel is 0.235" (6.0mm) versus 0.158" (4.0mm). Pretravel is not specified. These dimensional differences may impact mechanical fit and actuation characteristics in existing designs. Active product status, ROHS3 compliance, and 500,000 cycle electrical life are confirmed. Screw terminal termination requires wiring modifications.

Selection Criteria Summary:

• For direct replacement with minimal design modification: D4E-2G21N
• For applications requiring higher current capacity with identical mechanical parameters: D4E-1G21N
• For applications requiring significantly higher current capacity with acceptance of mechanical parameter variations: ZC-W255

All three substitutes maintain IP67 ingress protection, operating force/release force specifications, and MSL 1 rating. All are manufactured by Omron Automation and Safety with active product status.

Frequently Asked Questions (FAQ)

Q: Can the D4E-2G21N directly replace the SL1-PK in existing designs?

A: The D4E-2G21N maintains all critical electrical and mechanical parameters required for functional equivalence. Termination style differs (cable leads versus connector), requiring wiring harness modification. Actuator type differs (lever/roller versus round pin plunger), which may affect mechanical mounting interfaces. Physical fit verification in the specific application is necessary.

Q: What is the primary difference between D4E-2G21N and D4E-1G21N?

A: The D4E-1G21N is rated for 5A current capacity compared to 100mA for the D4E-2G21N. All mechanical parameters are identical. Selection depends on circuit current requirements. The D4E-1G21N provides higher current capacity for applications where the SL1-PK rating is insufficient.

Q: Why is ZC-W255 listed as a limited substitute?

A: The ZC-W255 exhibits significant mechanical parameter deviations from the SL1-PK. Operating position is 1.693" (43.0mm) versus 0.909" (23.1mm). Differential travel is 0.040" (1.0mm) versus 0.012" (0.3mm). Overtravel is 0.235" (6.0mm) versus 0.158" (4.0mm). These differences may impact mechanical fit and actuation response. Use ZC-W255 only when higher current capacity (10A AC/6A DC) is required and mechanical parameter variations are acceptable.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SL1-PK is RoHS Compliant. D4E-2G21N is RoHS Compliant. D4E-1G21N and ZC-W255 are ROHS3 Compliant. All meet RoHS requirements.

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

A: SL1-PK operates from -10°C to 70°C. D4E-2G21N, D4E-1G21N, and ZC-W255 all operate from -10°C to 80°C. The substitute parts provide extended upper temperature capability.

Q: Do all parts maintain IP67 ingress protection?

A: Yes. The SL1-PK and all three substitute parts (D4E-2G21N, D4E-1G21N, ZC-W255) are rated IP67 - Dust Tight, Waterproof.

Q: What termination styles are available among the substitutes?

A: SL1-PK uses Connector termination. D4E-2G21N and D4E-1G21N use Cable Leads termination. ZC-W255 uses Screw Terminal termination. Termination style selection depends on circuit integration requirements and available connection infrastructure.

Q: Are mechanical life specifications provided for all parts?

A: SL1-PK does not specify mechanical life. D4E-2G21N specifies 10,000,000 cycles. D4E-1G21N specifies 10,000,000 cycles. ZC-W255 specifies 10,000,000 cycles. All substitute parts provide documented mechanical life data.

Q: What is the MSL rating for these components?

A: All parts, including SL1-PK and all three substitutes, are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Can ZC-W255 be used in low-current applications?

A: Yes. ZC-W255 is rated for 10A AC and 6A DC, which exceeds the 100mA requirement of the SL1-PK. However, mechanical parameter differences (operating position, differential travel, overtravel) must be evaluated for compatibility with the specific application design.