SCHURTER 3-137-094 Pushbutton Switch SPDT 100mA Equivalent & Substitute Parts

Part Overview

The SCHURTER 3-137-094 is an anti-vandal illuminated pushbutton switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 100mA AC operation at 30V DC. This component is designed for panel-mount front installation with IP40 ingress protection and LED illumination in multiple color options. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain supply chain continuity for new designs and ongoing production requirements.

Substiute Parts

3-137-094

SCHURTER Inc.In Stock: 12443-137-094 Datasheet

Current PartRFQ

3-145-729

SCHURTER Inc.In Stock: 8253-145-729 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 3-137-094 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: SCHURTER Inc.
• Series: MSM
• Circuit Configuration: SPDT
• Switch Function: On-Momentary
• Current Rating: 100mA
• Voltage Rating - DC: 30V
• Mounting Type: Panel Mount, Front
• Actuator Type: Round Button, Flush
• Termination Style: Quick Connect - 0.110" (2.8mm)
• Ingress Protection: IP40

Allowable Variations:

• Panel cutout diameter tolerance: 22.00mm to 22.10mm
• Operating temperature range: Extended lower limit acceptable (-30°C vs -25°C)
• Mechanical life: Reduction from 1,500,000 to 200,000 cycles represents functional degradation but remains within anti-vandal switch category specifications
• Current specification: AC to DC conversion acceptable when voltage and power ratings remain equivalent
• Product status: Active status preferred for new designs and long-term availability

The SCHURTER 3-145-729 meets all mandatory matching parameters and represents the primary active equivalent within the MSM series.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SCHURTER 3-145-729

The SCHURTER 3-145-729 is the direct active equivalent for the obsolete 3-137-094. Both components share identical electrical specifications (SPDT circuit, 100mA, 30V DC), mechanical form factor (panel mount, round flush button, 22mm cutout), and termination interface (Quick Connect 0.110"). The 3-145-729 maintains IP40 ingress protection and supports identical LED illumination options.

Compatibility Considerations:

The 3-145-729 specifies 100mA DC operation versus the 3-137-094's 100mA AC rating. In applications requiring AC switching, circuit design must accommodate this specification change. The illumination voltage is explicitly defined as 24 VDC on the 3-145-729, whereas the 3-137-094 does not specify this parameter. Applications requiring illumination must supply 24 VDC to the illumination circuit.

The panel cutout diameter tolerance (22.00mm vs 22.10mm) is within standard mechanical tolerances for circular panel cutouts and does not preclude direct mechanical substitution.

The 3-145-729 specifies 200,000 mechanical cycles versus 1,500,000 cycles for the 3-137-094. Applications with high-cycle requirements must evaluate whether this reduced mechanical life rating meets operational demands.

The 3-145-729 carries active product status, ensuring ongoing availability and manufacturer support for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 3-145-729 directly replace the 3-137-094 in existing designs?

A: The 3-145-729 is mechanically and electrically compatible for direct substitution in panel-mount applications. The identical SPDT circuit, 100mA current rating, 30V DC voltage rating, Quick Connect termination, and IP40 protection ensure functional equivalence. However, the AC-to-DC current specification change and explicit 24 VDC illumination voltage requirement must be verified against circuit design parameters.

Q: What is the significance of the panel cutout diameter difference (22.00mm vs 22.10mm)?

A: The 0.10mm difference falls within standard mechanical tolerances for circular panel cutouts. Both parts utilize identical mounting hardware and panel interface specifications. No mechanical redesign is required for substitution.

Q: Does the reduced mechanical life rating (200,000 vs 1,500,000 cycles) affect substitution suitability?

A: The 3-145-729 mechanical life specification is lower than the 3-137-094. Applications requiring high-cycle operation must calculate expected switch actuation frequency against the 200,000-cycle rating to determine if the substitute part meets operational requirements. Low-cycle applications are unaffected by this specification difference.

Q: Is the 24 VDC illumination voltage specification on the 3-145-729 a critical parameter?

A: Yes. The 3-145-729 explicitly requires 24 VDC for LED illumination operation. Circuit designs must supply this voltage to the illumination terminals. The 3-137-094 does not specify illumination voltage, indicating this parameter may have been variable or application-dependent in the original design.

Q: Are there compliance or certification differences between the two parts?

A: The 3-137-094 is documented as ROHS3 Compliant. The 3-145-729 compliance status is not specified in the provided data. Applications subject to RoHS requirements should confirm compliance documentation with SCHURTER Inc. before final design approval.

Q: What is the inventory status for the substitute part?

A: The SCHURTER 3-145-729 has 780 pieces in new original stock. The 3-137-094 has 1,165 pieces in stock but is classified as obsolete. For new designs and long-term production, the 3-145-729 active status ensures ongoing availability.