ST11KMCQ Toggle Switch SPDT 6A 125V Equivalent & Substitute Parts

Part Overview

The ST11KMCQ is a panel-mount toggle switch manufactured by APEM Inc. with SPDT (Single Pole Double Throw) circuit configuration, rated for 6A AC at 125V and 7A DC at 30V. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where this specific model is no longer available through standard distribution channels.

Key Parameters

Parameter	ST11KMCQ
Manufacturer	APEM Inc.
Circuit Configuration	SPDT
Switch Function	On-On
Current Rating (AC)	6A
Current Rating (DC)	7A
Voltage Rating (AC)	125V
Voltage Rating (DC)	30V
Mounting Type	Panel Mount
Termination Style	PC Pin
Panel Cutout Diameter	6.35mm
Bushing Thread	1/4-40
Operating Temperature Range	-30°C to 85°C
Electrical Life	100,000 Cycles
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ST11KMCQ are selected based on the following critical parameters that must align for functional equivalence:

Circuit configuration: SPDT (Single Pole Double Throw)
Switch function: On-On
Current rating: Minimum 6A AC / 4A DC
Voltage rating: Minimum 125V AC / 28V DC
Mounting type: Panel Mount
Termination style: PC Pin
Panel cutout diameter: 6.35mm to 6.50mm
Bushing thread: 1/4-40
Operating temperature range: -30°C minimum to 85°C maximum

The following parts meet these substitution criteria:

Group 1 - Direct Electrical Equivalents (6A AC, 125V AC Rating):

A123P31HCQ (Electroswitch)
M2012SS1W03 (NKK Switches)
M2012SS1W03/CUL (NKK Switches)
MTA106DPC (TE Connectivity ALCOSWITCH Switches)

Group 2 - Reduced Current Rating (5A AC, 120V AC Rating):

100SP1T6B11M2QE (E-Switch)
100SP1T6B11M2QEH (E-Switch)

Parameter Comparison

Part Number	Manufacturer	Circuit	Current (AC)	Current (DC)	Voltage (AC)	Voltage (DC)	Panel Cutout (mm)	Bushing Thread	Operating Temp (°C)	Electrical Life (Cycles)	Status
ST11KMCQ	APEM Inc.	SPDT	6A	7A	125V	30V	6.35	1/4-40	-30 to 85	100,000	Obsolete
100SP1T6B11M2QE	E-Switch	SPDT	5A	5A	120V	28V	6.35	1/4-40	-30 to 85	40,000	Active
100SP1T6B11M2QEH	E-Switch	SPDT	5A	5A	120V	28V	6.35	1/4-40	-30 to 85	40,000	Active
A123P31HCQ	Electroswitch	SPDT	6A	6A	125V	28V	Not Specified	1/4-40	-30 to 90	60,000	Active
M2012SS1W03	NKK Switches	SPDT	6A	4A	125V	30V	6.50	1/4-40	-30 to 85	25,000	Obsolete
M2012SS1W03/CUL	NKK Switches	SPDT	6A	4A	125V	30V	6.50	1/4-40	-30 to 85	25,000	Obsolete
MTA106DPC	TE Connectivity ALCOSWITCH Switches	SPDT	6A	4A	125V	28V	6.40	1/4-40	-20 to 80	80,000	Active

Engineering Selection Recommendations

Primary Substitutes (Preferred):

MTA106DPC (TE Connectivity ALCOSWITCH Switches) is the recommended primary substitute. It maintains electrical equivalence with 6A AC at 125V, active product status, ROHS3 compliance, and panel-mount configuration with 1/4-40 bushing thread. The panel cutout diameter of 6.40mm is within acceptable tolerance of the original 6.35mm specification.

A123P31HCQ (Electroswitch) provides electrical equivalence at 6A AC and 125V AC with active product status and ROHS compliance. Panel cutout dimensions are not specified; verification with the manufacturer is required before implementation.

Secondary Substitutes (Reduced Electrical Performance):

100SP1T6B11M2QE and 100SP1T6B11M2QEH (E-Switch) are suitable for applications where the reduced current rating of 5A AC at 120V is acceptable. Both maintain active product status, ROHS3 compliance, and identical panel-mount specifications. These parts are appropriate for lower-power circuit implementations.

Obsolete Alternatives (Not Recommended for New Designs):

M2012SS1W03 and M2012SS1W03/CUL (NKK Switches) share electrical ratings with the ST11KMCQ but are classified as obsolete. These should not be selected for new designs due to availability constraints.

Frequently Asked Questions (FAQ)

Q: Can the 100SP1T6B11M2QE series be used as a direct replacement for the ST11KMCQ?

A: The E-Switch 100SP1T6B11M2QE and 100SP1T6B11M2QEH are functionally compatible for panel-mount applications with identical mechanical specifications (6.35mm cutout, 1/4-40 bushing thread). However, the current rating is reduced to 5A AC at 120V compared to the ST11KMCQ's 6A AC at 125V. Selection depends on circuit current requirements. If the application draws more than 5A AC, these parts are not suitable.

Q: What is the significance of the panel cutout diameter difference between MTA106DPC (6.40mm) and ST11KMCQ (6.35mm)?

A: The 0.05mm difference falls within standard mechanical tolerances for panel-mount switches. The MTA106DPC will fit within a 6.35mm circular cutout designed for the ST11KMCQ without mechanical interference.

Q: Why is the operating temperature range of MTA106DPC (-20°C to 80°C) narrower than the ST11KMCQ (-30°C to 85°C)?

A: The MTA106DPC has a reduced temperature operating range. If the application requires operation below -20°C or above 80°C, the MTA106DPC is not suitable. In such cases, A123P31HCQ (-30°C to 90°C) or the E-Switch series (-30°C to 85°C) should be evaluated.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant or RoHS compliant, matching the environmental compliance status of the ST11KMCQ.

Q: What is the difference between 100SP1T6B11M2QE and 100SP1T6B11M2QEH?

A: Both parts are electrically and mechanically identical. The designation difference reflects packaging or internal configuration variants. Consult the manufacturer datasheet for specific distinctions if required for your application.

Q: Can M2012SS1W03 be used despite its obsolete status?

A: M2012SS1W03 maintains electrical equivalence with the ST11KMCQ (6A AC, 125V AC) and identical mechanical specifications. However, obsolete status indicates limited availability through standard distribution. Use only if existing inventory is available and supply chain continuity is not a concern.

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