SL1-BK Equivalent & Substitute Parts Reference

Part Overview

The SL1-BK is an active snap-action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) switch is designed for chassis mount applications with screw terminal connections, rated for 100mA at 125V AC and 30V DC. The product is currently active in production with 1014 units in stock.

Equivalent and substitute parts are identified when alternative components meet or exceed the electrical and mechanical specifications of the original part, enabling procurement flexibility, inventory optimization, and supply chain continuity.

Substiute Parts

SL1-BK

Honeywell Sensing and Productivity SolutionsIn Stock: 1111SL1-BK Datasheet

Current PartRFQ

D4E-1D21N

Omron Automation and SafetyIn Stock: 815D4E-1D21N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SL1-BK is determined by the following critical parameters:

Electrical Compatibility:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Current rating must equal or exceed 100mA
• Voltage ratings must meet or exceed 125V AC and 30V DC

Mechanical Compatibility:

• Actuator type must be Roller Plunger
• Mounting type must be Chassis Mount
• Ingress protection must be IP67 or equivalent
• Operating and release forces must be within 1200gf and 500gf respectively
• Operating position tolerance must be within ±0.005" of 1.630"

Environmental & Compliance:

• Operating temperature range must encompass -10°C to 70°C minimum
• RoHS compliance required

The substitute part D4E-1D21N meets all critical electrical and mechanical parameters while providing enhanced performance specifications in current rating (5A vs 100mA) and operating temperature range (-10°C to 80°C vs -10°C to 70°C).

Parameter Comparison

Engineering Selection Recommendations

Primary Part - SL1-BK:

• Active product status with established supply (1014 units in stock)
• RoHS Compliant certification
• Screw terminal termination for permanent installation
• Suitable for applications requiring 100mA maximum current

Substitute Part - D4E-1D21N:

• Active product status with available inventory (710 units in stock)
• ROHS3 Compliant certification (enhanced RoHS standard)
• Cable lead termination requiring connector adaptation
• Higher current capacity (5A) provides design margin for applications up to 100mA
• Extended operating temperature range (-10°C to 80°C) accommodates broader environmental conditions
• Documented electrical life (500,000 cycles) and mechanical life (10,000,000 cycles) specifications

Selection between these parts depends on termination requirements. The SL1-BK is specified for screw terminal applications. The D4E-1D21N requires cable lead integration and is suitable as a substitute only when connector compatibility can be established in the application design.

Frequently Asked Questions (FAQ)

Q: Can D4E-1D21N directly replace SL1-BK in existing assemblies?

A: Direct replacement is not possible without modification. The SL1-BK uses screw terminals while the D4E-1D21N uses cable leads. Termination style conversion requires circuit board or harness redesign.

Q: What is the significance of the current rating difference (100mA vs 5A)?

A: The D4E-1D21N's 5A rating exceeds the SL1-BK's 100mA requirement. Both parts are suitable for applications drawing up to 100mA. The higher rating in the substitute part provides additional design margin and does not create incompatibility.

Q: Are the mechanical dimensions compatible?

A: Operating position measurements are 1.630" (SL1-BK) and 1.625" (D4E-1D21N), a difference of 0.005". This falls within standard mechanical tolerances for chassis mount switches. All other mechanical parameters (pretravel, differential travel, overtravel) are identical.

Q: What compliance certifications apply to each part?

A: SL1-BK holds RoHS Compliant certification. D4E-1D21N holds ROHS3 Compliant certification, which represents an enhanced version of the RoHS standard. Both parts meet current environmental compliance requirements.

Q: How do the operating temperature ranges differ?

A: SL1-BK operates from -10°C to 70°C. D4E-1D21N operates from -10°C to 80°C. The substitute part extends the upper temperature limit by 10°C, making it suitable for higher-temperature environments while remaining compatible with the original part's temperature specification.

Q: What is the inventory status for each part?

A: SL1-BK has 1014 units in stock. D4E-1D21N has 710 units in stock. Both parts are available as new original components.

Q: Are there differences in electrical or mechanical life specifications?

A: SL1-BK does not provide published electrical or mechanical life data. D4E-1D21N specifies 500,000 electrical cycles and 10,000,000 mechanical cycles. These specifications indicate documented performance characteristics for the substitute part.