UE43-2MF2D2 Equivalent & Substitute Parts

Part Overview

The UE43-2MF2D2 is a safety relay manufactured by SICK, Inc., configured as a 3PST (3-pole single-throw) unit with 6A contact rating and 24VAC/DC coil voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and new designs requiring compatible safety relay solutions. The UE43-2MF2D2 operates at 25 ms with screw terminal connections and is suitable for DIN rail mounting applications.

Substiute Parts

UE43-2MF2D2

SICK, Inc.In Stock: 800UE43-2MF2D2 Datasheet

Current PartRFQ

RLY3-EMSS1

SICK, Inc.In Stock: 958RLY3-EMSS1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the UE43-2MF2D2 is determined by the following critical parameters:

Contact Configuration & Current Rating: The main part operates as 3PST with 2 Form A and 1 Form B contacts at 6A. Substitute parts must maintain the 6A current rating and DIN rail mounting compatibility.

Coil Voltage Compatibility: The UE43-2MF2D2 accepts 24VAC/DC input. Substitutes operating on 24VDC are functionally compatible for DC-powered applications.

Switching Voltage & Contact Material: Maximum switching voltage of 230VAC/300VDC and silver/gold contact material define the electrical performance envelope. Substitutes must meet or exceed these specifications.

Termination & Mounting: Screw terminal and DIN rail mounting are standard interface requirements. Substitutes with alternative termination styles (spring terminal) remain compatible at the functional level but require installation method verification.

Response Time: The 25 ms operate time represents the switching speed characteristic. Faster substitutes (10 ms) provide improved response without compromising safety relay function.

The RLY3-EMSS1 qualifies as a substitute based on matching the 6A current rating, 24V coil voltage (DC variant), DIN rail mounting, and equivalent contact material specifications, despite differences in contact form configuration and termination style.

Parameter Comparison

Engineering Selection Recommendations

The RLY3-EMSS1 is an active product from SICK, Inc., providing continuity for applications currently using the obsolete UE43-2MF2D2. Both components share identical ECCN and HTSUS classifications, confirming regulatory equivalence.

Key Considerations:

The RLY3-EMSS1 operates on 24VDC (versus the UE43-2MF2D2's 24VAC/DC dual input), making it suitable for DC-powered control circuits. The substitute's 10 ms operate time is faster than the original 25 ms specification, which is advantageous for responsive safety applications.

The RLY3-EMSS1 features spring terminal connections instead of screw terminals, requiring installation method adjustment. The coil current reduction from 70 mA to 6 mA represents improved power efficiency in the substitute design.

Both components maintain 6A contact rating and equivalent contact material composition (Silver/Gold), ensuring electrical performance parity for switching applications up to 250VDC maximum.

Frequently Asked Questions (FAQ)

Q: Can the RLY3-EMSS1 directly replace the UE43-2MF2D2 in existing installations?

A: Functional replacement is possible for DC-powered circuits. The RLY3-EMSS1 requires 24VDC input (not 24VAC), and spring terminal connections must be accommodated in the installation. Contact form differences (DPST-NO versus 3PST-2NO/1NC) require circuit topology verification.

Q: What is the primary difference in contact configuration between these relays?

A: The UE43-2MF2D2 provides 3PST configuration with 2 normally-open and 1 normally-closed contact. The RLY3-EMSS1 provides DPST configuration with 2 normally-open contacts. Application requirements determine whether this difference affects compatibility.

Q: Does the faster operate time of the RLY3-EMSS1 (10 ms vs. 25 ms) affect safety relay performance?

A: Faster response time does not compromise safety function. The 10 ms operate time of the RLY3-EMSS1 provides improved switching speed, which is beneficial for time-critical safety applications.

Q: Are there compliance or regulatory differences between these components?

A: Both components share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications. No regulatory differentiation exists between the UE43-2MF2D2 and RLY3-EMSS1.

Q: What installation modifications are required when switching from screw terminals to spring terminals?

A: Spring terminal connections require different wiring techniques than screw terminals. Conductor preparation and insertion force differ between termination styles. Consult installation documentation for the RLY3-EMSS1 to ensure proper connection integrity.

Q: Is the reduced coil current (6 mA vs. 70 mA) in the RLY3-EMSS1 a concern?

A: Lower coil current indicates improved efficiency in the substitute design. This reduction does not affect relay function and reduces power consumption in the control circuit.