UE43-2MF3D2 Equivalent & Substitute Parts

Part Overview

The UE43-2MF3D2 is a safety relay manufactured by SICK, Inc., configured as a 3PST (3-pole single-throw) device with 6A contact rating and 24VAC/DC coil voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance and component procurement. The relay features screw terminal connections and operates at 25 ms, with silver and gold contact materials suitable for industrial safety applications.

Substiute Parts

UE43-2MF3D2

SICK, Inc.In Stock: 1169UE43-2MF3D2 Datasheet

Current PartRFQ

RLY3-EMSS1

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete UE43-2MF3D2 is evaluated based on the following critical parameters that determine functional equivalence:

• Mounting Type: DIN Rail compatibility ensures physical fit within existing enclosures
• Coil Voltage: 24VDC operation (subset of 24VAC/DC) maintains compatibility with control circuits
• Contact Rating: 6 A minimum requirement for load switching capacity
• Contact Form: Pole and throw configuration determines circuit control capability
• Termination Style: Connection method must accommodate existing wiring infrastructure
• Contact Material: Silver and gold composition ensures reliability in safety-critical applications

The RLY3-EMSS1 is identified as a substitute based on matching DIN Rail mounting, 24VDC coil voltage, 6 A contact rating, and compatible contact materials. However, differences in contact form configuration (DPST-NO versus 3PST-2NO/1NC) and termination style (Spring Terminal versus Screw Terminal) represent functional and installation variations that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The RLY3-EMSS1 is an active product from the same manufacturer, providing continuity of supply for the obsolete UE43-2MF3D2. Both devices share identical contact rating (6 A), coil voltage compatibility (24VDC operation), DIN Rail mounting, and contact material composition (Silver/Gold).

Selection of RLY3-EMSS1 as a substitute requires evaluation of the following differences:

• Contact Form Reduction: The substitute provides DPST-NO (2 Form A) versus the original 3PST-2NO/1NC configuration. Applications requiring the third pole or the normally-closed contact must be redesigned or alternative substitutes identified.
• Termination Compatibility: Spring Terminal connection differs from Screw Terminal. Existing wiring harnesses or terminal blocks designed for screw connections require adaptation or replacement.
• Switching Voltage Specification: The substitute maximum of 250VDC is lower than the original 300VDC specification. Applications operating at voltages between 250VDC and 300VDC are not suitable for this substitute.
• Regulatory Compliance: The RLY3-EMSS1 carries ROHS3 Compliant and REACH Unaffected certifications, meeting current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can RLY3-EMSS1 directly replace UE43-2MF3D2 in all applications?

A: No. The substitute has fewer poles and throws (DPST-NO versus 3PST-2NO/1NC), lower maximum switching voltage (250VDC versus 300VDC), and different termination style (Spring Terminal versus Screw Terminal). Circuit redesign may be required.

Q: What is the significance of the contact form difference?

A: The original UE43-2MF3D2 provides three poles with mixed contact types (2 normally-open, 1 normally-closed). The RLY3-EMSS1 provides only two poles, both normally-open. Applications requiring the third pole or normally-closed contact cannot use this substitute without circuit modification.

Q: Are both relays suitable for DIN Rail mounting in the same enclosure?

A: Yes. Both devices are DIN Rail mounted and share identical physical mounting compatibility. However, terminal connection methods differ and must be accommodated during installation.

Q: What is the impact of the 24VDC coil voltage specification on the substitute?

A: The original accepts both 24VAC and 24VDC. The substitute accepts 24VDC only. Applications using 24VAC control circuits require verification that the substitute operates correctly at the specified AC voltage, or the control circuit must be modified to DC operation.

Q: Does the lower coil current of RLY3-EMSS1 affect circuit design?

A: The substitute requires only 6 mA versus the original 70 mA. This represents reduced power consumption and may allow use of smaller control circuit components. Existing control circuits designed for 70 mA operation will function correctly with the lower current requirement.

Q: What certifications apply to the substitute part?

A: The RLY3-EMSS1 is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic components in industrial applications.