ST26KMCB Toggle Switch SP3T Equivalent & Substitute Parts

Part Overview

The ST26KMCB is a panel-mounted toggle switch manufactured by APEM Inc., configured as a single-pole triple-throw (SP3T) switch rated for 0.4VA at 20V AC/DC. The switch features a standard round actuator with PC pin termination and is designed for applications requiring three discrete switching positions. The product is classified as obsolete, making identification of equivalent and substitute components essential for ongoing maintenance, repair, and new design implementations where this switch type is specified.

Substiute Parts

ST26KMCB

APEM Inc.In Stock: 1020ST26KMCB Datasheet

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5244THCDB

APEM Inc.In Stock: 8345244THCDB Datasheet

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M2024SS1G03

NKK SwitchesIn Stock: 1483M2024SS1G03 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST26KMCB is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Circuit configuration (SP3T)
• Switch function (On-On-On)
• Current rating (0.4VA AC/DC)
• Voltage rating compatibility (minimum 20V AC/DC)
• Mounting type (Panel Mount)
• Termination style (PC Pin)
• Actuator type (Standard Round)
• Bushing thread specification (1/4-40)

Secondary Compatibility Factors:

• Panel cutout diameter tolerance
• Actuator length variation
• Operating temperature range
• Electrical life rating
• RoHS and regulatory compliance

The identified substitute parts maintain equivalence across primary criteria while permitting minor variations in secondary factors that do not affect functional interchangeability in standard applications.

Parameter Comparison

Engineering Selection Recommendations

5244THCDB (APEM Inc.) is the primary substitute for ST26KMCB applications. This part maintains identical electrical specifications (0.4VA, 20V AC/DC) and mechanical configuration while offering active product status, extended electrical life (50,000 cycles versus 40,000), and expanded operating temperature range (-40°C to 85°C). The 0.15mm increase in panel cutout diameter (6.50mm versus 6.35mm) and 0.09mm actuator length variation are within standard mechanical tolerances for panel-mount toggle switches. ROHS3 compliance is maintained.

M2024SS1G03 (NKK Switches) provides functional equivalence with elevated voltage rating (28V AC/DC versus 20V). This part is suitable for applications where the original 20V specification provides design margin or where higher voltage tolerance is beneficial. The cross-manufacturer substitution introduces material variation (chrome-plated versus nickel-plated actuator) and obsolete product status. Electrical life rating matches 5244THCDB at 50,000 cycles. ROHS3 compliance is maintained.

Selection between 5244THCDB and M2024SS1G03 depends on voltage requirement specificity and supply chain availability. For direct replacement in existing designs, 5244THCDB is preferred due to active product status and identical voltage specification.

Frequently Asked Questions (FAQ)

Q: Can the 5244THCDB directly replace the ST26KMCB in existing designs?

A: Yes. The 5244THCDB maintains identical electrical ratings (0.4VA, 20V AC/DC), circuit configuration (SP3T), switch function (On-On-On), mounting type (Panel Mount), and termination style (PC Pin). Panel cutout diameter increases from 6.35mm to 6.50mm, which is within standard mechanical tolerance for panel-mount applications. Actuator length variation (10.50mm versus 10.41mm) does not affect functional performance.

Q: What is the significance of the M2024SS1G03 higher voltage rating?

A: The M2024SS1G03 is rated for 28V AC/DC compared to the ST26KMCB specification of 20V AC/DC. This higher voltage rating does not affect compatibility in 20V applications; the part operates safely at lower voltages. The higher rating provides additional design margin in applications where voltage tolerance is a consideration. However, the part remains classified as obsolete.

Q: Are there mechanical compatibility concerns with panel cutout diameter differences?

A: The panel cutout diameter increases from 6.35mm (ST26KMCB) to 6.50mm (5244THCDB and M2024SS1G03). This 0.15mm increase is within standard mechanical tolerance for panel-mount toggle switches. Existing panel cutouts at 6.35mm may require minor enlargement to accommodate the substitute part. Bushing thread specification (1/4-40) remains identical across all parts.

Q: How do electrical life ratings affect component selection?

A: The ST26KMCB is rated for 40,000 electrical cycles, while both substitute parts (5244THCDB and M2024SS1G03) are rated for 50,000 cycles. Higher electrical life rating indicates extended operational durability. For applications with high switching frequency, the substitute parts provide improved longevity. This difference does not affect electrical or mechanical compatibility.

Q: What is the impact of actuator material differences?

A: The ST26KMCB and 5244THCDB feature brass actuators with nickel plating. The M2024SS1G03 features brass actuator with chrome plating. Both plating materials provide corrosion resistance and durability. Material selection does not affect electrical performance or mechanical interchangeability in standard applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The ST26KMCB, 5244THCDB, and M2024SS1G03 are all ROHS3 compliant. Regulatory compliance is maintained across all identified substitute parts.

Q: What is the product status significance for component selection?

A: The ST26KMCB is classified as obsolete, indicating discontinued manufacturing. The 5244THCDB is active, indicating current production and ongoing availability. The M2024SS1G03 is obsolete. For new designs and long-term supply chain planning, the active status of 5244THCDB provides supply continuity advantages over obsolete alternatives.