PLKB3220 Keylock Switch Equivalent & Substitute Parts

Part Overview

The PLKB3220 is a keylock switch manufactured by APEM Inc., featuring a 2-position SPDT circuit with 500mA DC rating at 30V. This component is designed for panel-mount applications requiring key-actuated switching with flat key actuation and 90° throw angle. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and redesign applications.

Substiute Parts

PLKB3220

APEM Inc.In Stock: 1118PLKB3220 Datasheet

Current PartRFQ

Y101132C203NQ

C&KIn Stock: 2266Y101132C203NQ Datasheet

SimilarRFQ

Y1011U2C203NQ

C&KIn Stock: 6576Y1011U2C203NQ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PLKB3220 keylock switch is determined by the following critical parameters:

Circuit and Functional Requirements:

• SPDT circuit configuration with 2-position, On-On switch function
• Flat key actuator type
• 90° angle of throw
• Panel mount configuration with solder lug termination

Electrical Performance Criteria:

• Current rating must meet or exceed 500mA DC requirement
• Voltage rating must support minimum 30V DC operation
• Electrical life specification of 10,000 cycles

Mechanical and Physical Compatibility:

• Panel cutout diameter compatibility (original: 16.00mm)
• Depth behind flange within acceptable installation envelope
• Mechanical life rating of 10,000 cycles

Compliance and Environmental:

• ROHS3 compliance maintained
• Operating temperature range coverage
• MSL rating of 1 (Unlimited)

The substitute parts identified (Y101132C203NQ and Y1011U2C203NQ) satisfy the core functional requirements of SPDT 2-position keylock switching with flat key actuation. Both substitutes exceed the original current rating (4A vs. 500mA) and maintain voltage compatibility at 28V DC minimum. However, physical installation differences exist due to panel cutout diameter variance (19.30mm vs. 16.00mm).

Parameter Comparison

Engineering Selection Recommendations

Y1011U2C203NQ (Preferred Substitute)

This C&K keylock switch is the primary substitute for the obsolete PLKB3220. It maintains active product status with full ROHS3 compliance and identical MSL rating. The part matches all critical functional parameters: SPDT 2-position On-On configuration, flat key actuation, 90° throw, and solder lug termination. The 4A AC/DC current rating exceeds the original 500mA requirement, and 28V DC rating supports the 30V DC application with minimal margin. Key removable in all positions matches the original specification. The 19.30mm panel cutout diameter requires panel modification from the original 16.00mm specification. Depth behind flange (28.83mm) is compatible with the original installation envelope.

Y101132C203NQ (Secondary Substitute)

This C&K alternative provides identical electrical and functional characteristics to Y1011U2C203NQ with one functional difference: key removable in 1 position only, versus all positions on the original PLKB3220. This restriction may impact operational requirements in applications requiring key removal at multiple switch positions. All other parameters, including current rating, voltage rating, circuit configuration, and compliance certifications, are equivalent to the primary substitute. Panel cutout diameter and depth behind flange specifications are identical to Y1011U2C203NQ.

Frequently Asked Questions (FAQ)

Q: Can the C&K substitutes directly replace the PLKB3220 without panel modification?

A: Electrical and functional compatibility is confirmed. However, the panel cutout diameter differs: original PLKB3220 requires 16.00mm diameter, while both C&K substitutes require 19.30mm diameter. Panel drilling or enlargement is necessary for mechanical installation.

Q: What is the significance of the current rating difference (500mA vs. 4A)?

A: The substitute parts exceed the original current specification. In applications operating at or below 500mA DC, the higher rating provides additional design margin. In applications requiring the full 4A capability, the substitutes offer expanded operational range. The original circuit design must be evaluated to confirm compatibility with the higher-rated component.

Q: How does the key removable position difference affect substitution?

A: The PLKB3220 allows key removal in all positions. Y1011U2C203NQ maintains this feature. Y101132C203NQ restricts key removal to 1 position only. Applications requiring key removal at multiple switch positions must use Y1011U2C203NQ to maintain functional equivalence.

Q: Are there voltage rating concerns with 28V DC substitutes in a 30V DC application?

A: The substitute parts are rated 28V DC minimum. The original application operates at 30V DC, which exceeds the substitute rating by 2V. This represents a 7% overvoltage condition. Circuit design review is required to determine if this margin is acceptable for the specific application, or if voltage regulation is necessary.

Q: Do the substitute parts maintain the same contact material?

A: No. The original PLKB3220 uses brass contacts with silver finish. Both C&K substitutes use copper contacts with silver finish. Contact material differences may affect electrical characteristics in specific applications. Electrical performance validation is recommended for critical switching applications.

Q: Are all parts ROHS3 compliant?

A: Yes. The PLKB3220 and both substitute parts (Y101132C203NQ and Y1011U2C203NQ) are ROHS3 compliant with MSL rating of 1 (Unlimited), ensuring compatibility with modern manufacturing and environmental standards.