ST12L3MZQ Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The ST12L3MZQ is a panel-mount toggle switch manufactured by APEM Inc., configured as a Single Pole Double Throw (SPDT) switch with On-Off-On functionality. This component is rated for 6A at 125V AC and 7A at 30V DC, featuring a standard round actuator with solder lug termination. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this switch type is required.

Substiute Parts

ST12L3MZQ

APEM Inc.In Stock: 965ST12L3MZQ Datasheet

Current PartRFQ

7103MYZQE

C&KIn Stock: 9527103MYZQE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST12L3MZQ is determined by the following critical parameters:

• Circuit Configuration: SPDT topology must be maintained
• Switch Function: On-Off-On operation required
• Current Rating: Substitute must support minimum 6A AC or equivalent DC rating
• Voltage Rating: Substitute must support minimum 125V AC or equivalent DC rating
• Mounting Interface: Panel mount with 6.35mm circular cutout and 1/4-40 bushing thread
• Termination: Solder lug connection required
• Operating Temperature: -30°C to 85°C range compatibility
• Electrical Life: 40,000 cycles minimum

The C&K 7103MYZQE satisfies these substitution criteria with equivalent mechanical mounting, electrical circuit topology, and operational specifications within acceptable tolerance ranges for this switch category.

Parameter Comparison

Engineering Selection Recommendations

The C&K 7103MYZQE serves as a functional substitute for the obsolete ST12L3MZQ based on the following engineering criteria:

Mechanical Compatibility: Both switches feature identical panel mount interfaces with 6.35mm circular cutouts and 1/4-40 bushing threads, enabling direct mechanical replacement without panel modification.

Electrical Circuit Equivalence: Both components implement SPDT topology with On-Off-On switching function, maintaining identical circuit behavior in applications.

Compliance Status: The 7103MYZQE is ROHS3 compliant and actively manufactured, providing supply chain continuity for the obsolete ST12L3MZQ. The substitute is REACH Affected, requiring verification against specific application regulatory requirements.

Current and Voltage Ratings: The 7103MYZQE is rated for 5A AC/DC at 120V AC and 28V DC. Applications operating at or below these ratings are directly compatible. Applications requiring the full 6A AC or 7A DC rating of the original component must evaluate load characteristics against the substitute's lower current specification.

Operational Parameters: Identical operating temperature range (-30°C to 85°C) and electrical life (40,000 cycles) ensure equivalent performance characteristics in thermal and cycling environments.

Frequently Asked Questions (FAQ)

Q: Can the C&K 7103MYZQE directly replace the ST12L3MZQ in all applications?

A: Direct mechanical and circuit replacement is possible due to identical panel mount interfaces and SPDT On-Off-On topology. However, applications requiring current ratings above 5A must evaluate whether the substitute's lower current specification is acceptable for the specific load.

Q: What are the key differences between these switches?

A: The primary differences are current rating (ST12L3MZQ: 6A AC/7A DC; 7103MYZQE: 5A AC/DC), voltage rating (ST12L3MZQ: 125V AC/30V DC; 7103MYZQE: 120V AC/28V DC), and product status (ST12L3MZQ: Obsolete; 7103MYZQE: Active). Mechanical mounting and circuit configuration are identical.

Q: Are there packaging considerations for the substitute?

A: The ST12L3MZQ is supplied in standard packaging, while the 7103MYZQE is supplied in bulk packaging. This does not affect component functionality or panel installation.

Q: What is the REACH status difference, and does it matter?

A: The ST12L3MZQ is REACH Unaffected, while the 7103MYZQE is REACH Affected. Applications subject to REACH regulations must verify the substitute's compliance status against specific regulatory requirements for the intended market and application.

Q: Can I use the 7103MYZQE in a 6A application?

A: The 7103MYZQE is rated for 5A maximum. Using it in applications requiring 6A operation exceeds the component's electrical specification and is not recommended based on provided ratings.