ST11KHZB Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The ST11KHZB is a panel mount toggle switch manufactured by APEM Inc., featuring SPDT (Single Pole Double Throw) circuitry with On-On switching function. This component is rated for 0.4VA at 20V AC/DC with a non-illuminated standard round actuator. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and new designs requiring compatible switching functionality.

Key Parameters

Parameter	ST11KHZB
Manufacturer	APEM Inc.
Circuit Configuration	SPDT
Switch Function	On-On
Current Rating	0.4VA (AC/DC)
Voltage Rating - AC	20 V
Voltage Rating - DC	20 V
Mounting Type	Panel Mount
Actuator Type	Standard Round
Actuator Length	10.41 mm
Panel Cutout Diameter	6.35 mm
Bushing Thread	1/4-40
Termination Style	Solder Lug
Operating Temperature Range	-30°C to 85°C
Electrical Life	100,000 Cycles
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ST11KHZB is determined by the following critical parameters:

Electrical Compatibility: Circuit configuration (SPDT), switch function (On-On), and voltage/current ratings must support the application's electrical requirements. The ST11KHZB operates at 0.4VA with 20V maximum. Substitute parts must either match or exceed these ratings.

Mechanical Compatibility: Panel mount configuration, actuator type (standard round), panel cutout diameter (6.35 mm), and bushing thread (1/4-40) must align with existing panel installations. Actuator length variations are acceptable if the switch mechanism remains functionally equivalent.

Environmental & Compliance: Operating temperature range, electrical life cycles, RoHS compliance, and termination style (solder lug) ensure functional equivalence in the target application environment.

The substitute parts listed are NKK Switches M2100 series toggle switches that maintain SPDT On-On configuration and panel mount design with 1/4-40 bushing threads. These parts exceed the ST11KHZB electrical ratings (6A AC / 3A DC at 125V AC or 30V DC) and support higher voltage and current applications. Most substitute options include LED illumination, which is an enhancement over the non-illuminated ST11KHZB.

Parameter Comparison

Parameter	ST11KHZB	M2112LCFW01	M2112LCG01	M2112LCW01	M2112LEW01	M2112LFW01	M2112TCFW01	M2112TCW01	M2112TCW01/CUL	M2112TEW01	M2112TFW01
Manufacturer	APEM Inc.	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches	NKK Switches
Circuit Configuration	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-On	On-On	On-On	On-On	On-On	On-On	On-On	On-On	On-On	On-On	On-On
Current Rating (AC)	0.4VA	6A	0.4VA	6A	6A	6A	6A	6A	6A	6A	6A
Current Rating (DC)	0.4VA	3A	0.4VA	3A	3A	3A	3A	3A	3A	3A	3A
Voltage Rating - AC	20 V	125 V	28 V	125 V	125 V	125 V	125 V	125 V	125 V	125 V	125 V
Voltage Rating - DC	20 V	30 V	28 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V	30 V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Actuator Type	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round	Standard Round
Actuator Length	10.41 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm	14.70 mm
Panel Cutout Diameter	6.35 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm	6.50 mm
Bushing Thread	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug
Operating Temperature Range	-30°C to 85°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C	-10°C to 55°C
Electrical Life	100,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles	25,000 Cycles
Illumination	Non-Illuminated	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)	Illuminated (LED)
Product Status	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and obsolete product status consistent with the ST11KHZB. Selection among the NKK Switches M2100 series alternatives depends on application-specific requirements:

For Low-Voltage Applications (20V DC or less): M2112LCG01 is the closest electrical match, rated for 0.4VA at 28V DC, providing minimal voltage margin above the ST11KHZB specification.

For Higher-Voltage or Higher-Current Applications: M2112LCFW01, M2112LCW01, M2112LEW01, M2112LFW01, M2112TCFW01, M2112TCW01, M2112TCW01/CUL, M2112TEW01, and M2112TFW01 all support 6A AC at 125V AC or 3A DC at 30V DC, providing substantial electrical headroom for applications exceeding the ST11KHZB ratings.

Illumination Consideration: All substitute parts include LED illumination with color options (Red, Green, Yellow, or Green/Red dual-color). Applications requiring non-illuminated operation must account for this functional enhancement or confirm compatibility with the target system design.

Mechanical Fit: Panel cutout diameter increases from 6.35 mm (ST11KHZB) to 6.50 mm (all substitutes). Existing panel cutouts may require minor enlargement. Actuator length increases from 10.41 mm to 14.70 mm; confirm clearance in the target installation environment.

Electrical Life Trade-off: The ST11KHZB provides 100,000 electrical cycles, while all substitute parts are rated for 25,000 cycles. Applications with high switching frequency must account for this reduced cycle life.

Frequently Asked Questions (FAQ)

Q: Can M2112 series switches directly replace the ST11KHZB without panel modification?

A: Panel cutout diameter increases from 6.35 mm to 6.50 mm. Existing cutouts may require minor enlargement. Actuator length increases from 10.41 mm to 14.70 mm; confirm adequate clearance behind the panel.

Q: What is the primary electrical difference between the ST11KHZB and substitute parts?

A: The ST11KHZB is rated for 0.4VA at 20V. Most substitute parts (except M2112LCG01) are rated for 6A AC at 125V AC or 3A DC at 30V DC, providing significantly higher electrical capacity. M2112LCG01 matches the 0.4VA rating at 28V DC.

Q: Are all substitute parts illuminated?

A: Yes. All listed NKK Switches M2100 series alternatives include LED illumination with various color options. The ST11KHZB is non-illuminated. Confirm that illumination is compatible with the target application or that the LED can be disabled if necessary.

Q: What is the impact of reduced electrical life in substitute parts?

A: The ST11KHZB supports 100,000 electrical cycles, while substitute parts support 25,000 cycles. For applications with high switching frequency, evaluate whether the reduced cycle life meets operational requirements.

Q: Do all substitute parts maintain the same termination style?

A: Yes. All substitute parts use solder lug termination, matching the ST11KHZB. Electrical connections are compatible without modification.

Q: Which substitute part is best for low-voltage DC applications?

A: M2112LCG01 is rated for 0.4VA at 28V DC, providing the closest electrical match to the ST11KHZB (0.4VA at 20V DC). This part is suitable for applications operating at or below 28V DC with minimal current draw.

Q: Are there packaging differences among the substitute parts?

A: Packaging varies between Bulk and unspecified options. Confirm packaging requirements for procurement and inventory management. Electrical and mechanical specifications remain consistent across all packaging variants.

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