B12KH Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The B12KH is an NKK Switches toggle switch with SPDT (Single Pole Double Throw) configuration, rated for 0.4VA at 28V AC/DC. This through-hole, right-angle mounted switch features a lever actuator with epoxy sealed terminals and is designed for On-On switching applications. The part maintains Active product status with 865 units in current inventory.

Substitute parts become necessary when the B12KH reaches end-of-life, experiences supply constraints, or when design requirements permit operation at lower voltage ratings while maintaining equivalent electrical and mechanical characteristics.

Substiute Parts

B12KH

NKK SwitchesIn Stock: 895B12KH Datasheet

Current PartRFQ

200MSP1T2B2M6RE

E-SwitchIn Stock: 816200MSP1T2B2M6RE Datasheet

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34CMSP12B4M6RT

Grayhill Inc.In Stock: 70934CMSP12B4M6RT Datasheet

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T101MH9ABE

C&KIn Stock: 2300T101MH9ABE Datasheet

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TT11DGRA1

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1271TT11DGRA1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B12KH is determined by strict equivalence in the following parameters:

• Circuit Configuration: Must be SPDT
• Switch Function: Must be On-On
• Current Rating: Must be 0.4VA (AC/DC)
• Mounting Type: Must be Through Hole, Right Angle
• Termination Style: Must be PC Pin
• Operating Temperature Range: Must support -30°C to 85°C minimum
• Voltage Rating: Substitute parts rated at 20V AC/DC are acceptable as they operate within the B12KH's 28V specification

All four substitute parts meet these core substitution criteria. Variations in actuator type, actuator length, electrical life, and actuator material do not prevent substitution but represent design trade-offs documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are ROHS3 compliant and maintain MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

For applications requiring REACH Unaffected status: Select 200MSP1T2B2M6RE (E-Switch) or 34CMSP12B4M6RT (Grayhill Inc.). Both parts carry REACH Unaffected designation and are suitable for regulated supply chains.

For applications prioritizing extended electrical life: Select TT11DGRA1 (TE Connectivity ALCOSWITCH Switches) with 80,000 cycles, or T101MH9ABE (C&K) with 60,000 cycles. These exceed the B12KH's 50,000-cycle rating.

For applications with standard electrical life requirements: 200MSP1T2B2M6RE and 34CMSP12B4M6RT both provide 30,000 cycles, suitable for moderate-duty applications.

Voltage consideration: All substitutes operate at 20V AC/DC, which is within the B12KH's 28V specification. Applications operating at or below 20V present no electrical constraints. Applications requiring full 28V operation must retain the B12KH.

Frequently Asked Questions (FAQ)

Q: Can I use a 20V-rated substitute in a 28V circuit? A: No. Substitute parts rated at 20V AC/DC are not suitable for circuits operating above 20V. The B12KH must be retained for 28V applications.

Q: What is the primary difference between substitute options? A: Electrical life rating and REACH compliance status differ. E-Switch and Grayhill parts carry REACH Unaffected status; C&K and TE Connectivity parts carry REACH Affected status. Electrical life ranges from 30,000 to 80,000 cycles across the substitute group.

Q: Are actuator length differences significant? A: Actuator length varies from 5.00mm (B12KH) to 5.61mm (TT11DGRA1). Panel cutout dimensions and mechanical clearance must be verified during design integration. The B12KH features a lever actuator; all substitutes use standard round actuators, which may affect tactile feedback and operational feel.

Q: Do all parts share identical termination? A: Yes. All parts use PC Pin termination, ensuring direct PCB compatibility without adapter requirements.

Q: Which substitute offers the best overall specification match? A: T101MH9ABE (C&K) provides 60,000 electrical cycles, exceeding the B12KH's 50,000-cycle rating, while maintaining all core electrical and mechanical parameters. However, REACH Affected status may restrict use in certain regulated applications.