UE23-3MF2D2 Equivalent & Substitute Parts

Part Overview

The UE23-3MF2D2 is a safety relay manufactured by SICK, Inc., configured as a 4PST (4-pole single-throw) device with 8A contact rating and 24VDC coil voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and redesign applications. The relay is designed for DIN Rail mounting with screw terminal connections and operates across industrial switching voltage ranges up to 230VAC and 300VDC maximum.

Substiute Parts

UE23-3MF2D2

SICK, Inc.In Stock: 1149UE23-3MF2D2 Datasheet

Current PartRFQ

RLY3-EMSS300

SICK, Inc.In Stock: 1259RLY3-EMSS300 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the UE23-3MF2D2 is determined by alignment across the following critical parameters:

• Coil Voltage: 24VDC (primary control signal requirement)
• Mounting Type: DIN Rail (physical form factor)
• Contact Form and Rating: Pole configuration and current-carrying capacity
• Switching Voltage Range: Maximum voltage withstand capability
• Termination Style: Connection method compatibility
• Contact Material Composition: Silver and gold plating for reliability

The RLY3-EMSS300 is identified as a substitute based on shared coil voltage (24VDC), DIN Rail mounting, compatible contact material (Silver/Gold), and equivalent switching voltage specifications. However, differences in contact form (3PST-NO vs. 4PST-3NO/1NC), current rating (6A vs. 8A), and termination style (Spring Terminal vs. Screw Terminal) must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The RLY3-EMSS300 is an active product from the same manufacturer (SICK, Inc.) and shares critical electrical parameters with the obsolete UE23-3MF2D2, including 24VDC coil voltage, DIN Rail mounting, and equivalent contact material composition. Both components carry identical ECCN and HTSUS classifications, confirming regulatory alignment.

Selection of the RLY3-EMSS300 as a substitute requires verification that the following parameter differences are acceptable for the target application:

• Contact form reduction from 4PST-3NO/1NC to 3PST-NO eliminates one normally-closed contact
• Current rating decrease from 8A to 6A reduces maximum load capacity
• Switching voltage maximum decreases from 300VDC to 230VDC
• Termination transition from screw to spring terminal requires connection method adaptation
• Operate time improvement from 80ms to 12ms may affect timing-dependent circuits

The RLY3-EMSS300 is RoHS3 compliant and REACH unaffected, providing compliance advantages over the obsolete UE23-3MF2D2.

Frequently Asked Questions (FAQ)

Q: Can the RLY3-EMSS300 directly replace the UE23-3MF2D2 in existing installations?

A: Direct replacement requires circuit-level evaluation. The RLY3-EMSS300 has fewer poles (3 vs. 4), lower current rating (6A vs. 8A), and uses spring terminals instead of screw terminals. If the application uses all four poles of the original relay or requires 8A switching capacity, the RLY3-EMSS300 is not suitable without circuit redesign.

Q: What is the significance of the contact form difference (4PST-3NO/1NC vs. 3PST-NO)?

A: The UE23-3MF2D2 provides three normally-open contacts and one normally-closed contact. The RLY3-EMSS300 provides only three normally-open contacts. Applications requiring a normally-closed contact cannot use the substitute without additional relay logic.

Q: How does the current rating difference affect substitution?

A: The UE23-3MF2D2 is rated for 8A per contact, while the RLY3-EMSS300 is rated for 6A. If the application switches loads exceeding 6A, the RLY3-EMSS300 will not meet electrical requirements and substitution is not permissible.

Q: Are the switching voltage ranges compatible?

A: Both relays support 230VAC switching. However, the UE23-3MF2D2 supports 300VDC maximum, while the RLY3-EMSS300 supports 230VDC maximum. Applications requiring 300VDC switching cannot use the RLY3-EMSS300.

Q: What is the impact of the termination style change?

A: The UE23-3MF2D2 uses screw terminals for fixed wire connections. The RLY3-EMSS300 uses spring terminals, which accommodate push-in wire connections. Existing screw-terminal wiring harnesses require adaptation or replacement.

Q: Does the faster operate time of the RLY3-EMSS300 (12ms vs. 80ms) create compatibility issues?

A: The faster response time may affect circuits designed around the original 80ms operate time. Applications with timing-dependent logic or synchronization requirements must be re-evaluated.

Q: Are both relays compliant with the same regulatory standards?

A: Both components share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications. The RLY3-EMSS300 additionally carries RoHS3 compliance and REACH unaffected status, providing enhanced regulatory alignment for modern applications.