S4012 Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The NKK Switches S4012 is a panel-mount toggle switch with SPDT (Single Pole Double Throw) configuration rated for 6A at 125V AC and 4A at 30V DC. This component features a standard round actuator with solder lug termination and operates across -10°C to 70°C. The S4012 is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing maintenance, repair, and new design applications where this switch type is specified.

Substiute Parts

S4012

NKK SwitchesIn Stock: 1154S4012 Datasheet

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M2012BB1W01

NKK SwitchesIn Stock: 1191M2012BB1W01 Datasheet

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MTG106D

TE Connectivity ALCOSWITCH SwitchesIn Stock: 2085MTG106D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S4012 are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or exceed the main part specifications:

Critical Matching Parameters:

• Circuit configuration: SPDT
• Switch function: On-On
• Current rating: minimum 6A AC / 4A DC
• Voltage rating: minimum 125V AC / 30V DC
• Mounting type: Panel Mount
• Termination style: Solder Lug
• Actuator type: Standard Round
• Panel cutout compatibility: Circular 12.50mm diameter or compatible bushing thread

Allowable Variations:

• Actuator length: minor variations acceptable (11.50mm to 12.00mm)
• Operating temperature range: may exceed specified range
• Electrical life: may exceed specified cycles
• Bushing thread: alternative threads acceptable if panel cutout diameter is compatible
• Manufacturer: different manufacturers acceptable if electrical and mechanical parameters align

Two substitute parts meet these criteria: M2012BB1W01 (NKK Switches) and MTG106D (TE Connectivity ALCOSWITCH Switches).

Parameter Comparison

Engineering Selection Recommendations

M2012BB1W01 (NKK Switches): This substitute maintains identical electrical ratings (6A AC / 125V, 4A DC / 30V) and mechanical interface (M12 x 1 bushing thread, 12.50mm panel cutout). Both parts are from the same manufacturer and share the same termination style. The M2012BB1W01 offers extended operating temperature range (-30°C to 85°C versus -10°C to 70°C) and increased electrical life (25,000 cycles versus 10,000 cycles). However, the M2012BB1W01 is also classified as obsolete. This substitute is suitable for direct replacement in existing designs where NKK Switches sourcing is preferred and panel cutout dimensions are fixed.

MTG106D (TE Connectivity ALCOSWITCH Switches): This substitute meets all critical electrical parameters (6A AC / 125V, 4A DC / 28V) and maintains panel mount configuration with solder lug termination. The MTG106D is classified as active product status, ensuring ongoing availability. The part features extended operating temperature range (-20°C to 80°C) and significantly higher electrical life (80,000 cycles). The panel cutout diameter is 11.94mm (versus 12.50mm) and bushing thread is 15/32-32 (versus M12 x 1), requiring panel modification or adapter consideration. The MTG106D is RoHS non-compliant and REACH affected, which may impact regulatory compliance requirements for new designs.

For new designs and applications requiring long-term component availability, MTG106D is the preferred selection despite panel interface differences. For direct mechanical replacement in existing panels, M2012BB1W01 is the appropriate choice.

Frequently Asked Questions (FAQ)

Q: Can M2012BB1W01 be used as a direct replacement for S4012? A: Yes. Both parts share identical electrical ratings (6A AC / 125V, 4A DC / 30V), circuit configuration (SPDT On-On), and mechanical interface (M12 x 1 bushing thread, 12.50mm panel cutout diameter). No panel modification is required.

Q: Can MTG106D be used as a direct replacement for S4012? A: MTG106D meets all electrical requirements but requires panel modification. The panel cutout diameter is 11.94mm (S4012 is 12.50mm) and the bushing thread is 15/32-32 (S4012 is M12 x 1). Mechanical interface adaptation is necessary.

Q: What is the difference in electrical life between these parts? A: S4012 is rated for 10,000 cycles, M2012BB1W01 for 25,000 cycles, and MTG106D for 80,000 cycles. Higher electrical life indicates longer operational durability under repeated switching conditions.

Q: Are there compliance differences between these substitutes? A: S4012 and M2012BB1W01 are both REACH unaffected. MTG106D is REACH affected and RoHS non-compliant, while M2012BB1W01 is RoHS3 compliant. Regulatory requirements for your application determine which substitute is acceptable.

Q: Why is product status important for component selection? A: S4012 and M2012BB1W01 are obsolete, meaning manufacturer production has ended and availability is limited to existing inventory. MTG106D is active product, ensuring continued manufacturing and long-term supply chain stability for new designs.

Q: What is the operating temperature difference? A: S4012 operates -10°C to 70°C, M2012BB1W01 operates -30°C to 85°C, and MTG106D operates -20°C to 80°C. Both substitutes exceed the original part's temperature range, providing broader environmental compatibility.