UE42-2HD3D2 Equivalent & Substitute Parts

Part Overview

The UE42-2HD3D2 is a safety relay manufactured by SICK, Inc., configured as a 3PST (3-pole single-throw) device with 6A contact rating and 24VDC coil voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and new design implementations. The relay features screw terminal connections and operates at 50 ms response time with silver and gold contact materials suitable for industrial control applications.

Substiute Parts

UE42-2HD3D2

SICK, Inc.In Stock: 987UE42-2HD3D2 Datasheet

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RLY3-HAND1

SICK, Inc.In Stock: 1104RLY3-HAND1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the UE42-2HD3D2 is evaluated based on the following critical parameters that define functional equivalence:

• Coil Voltage: 24VDC (must match for direct circuit compatibility)
• Contact Rating: 6 A minimum (load-carrying capacity)
• Mounting Type: DIN Rail (physical installation requirement)
• Switching Voltage: Maximum rating must accommodate 230VAC and 300VDC applications
• Contact Material: Silver and gold composition for reliability
• Termination Style: Connection method compatibility

The substitute part RLY3-HAND1 maintains compatibility across coil voltage, contact rating, mounting type, and contact material specifications. However, differences exist in contact form configuration and operating characteristics that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The RLY3-HAND1 is an active product from SICK, Inc., providing continuity for applications requiring 24VDC coil voltage and 6A contact rating on DIN Rail-mounted safety relays. The substitute maintains core electrical specifications including coil voltage, contact current rating, and contact material composition.

Key differences require circuit-level evaluation:

• Contact Form: The main part provides 3PST configuration (2 normally open, 1 normally closed), while the substitute provides DPST configuration (2 normally open only). Applications requiring normally closed contacts must be redesigned or alternative substitutes identified.
• Switching Voltage: The substitute maximum rating of 250VDC is lower than the main part's 300VDC specification. Applications operating at 300VDC are not compatible with this substitute.
• Termination: Spring terminal connection differs from screw terminal, requiring mechanical installation adjustment.
• Operating Speed: The substitute operates at 10 ms versus 50 ms for the main part, representing faster response characteristics suitable for time-critical applications.
• Coil Current: The substitute draws 6 mA versus 40 mA, reducing power consumption in the control circuit.

The RLY3-HAND1 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards applicable to active products.

Frequently Asked Questions (FAQ)

Q: Can RLY3-HAND1 directly replace UE42-2HD3D2 in existing circuits?

A: Direct replacement requires verification of three factors: (1) the circuit must not require normally closed contacts, as RLY3-HAND1 provides only normally open contacts; (2) the maximum switching voltage in the application must not exceed 250VDC; (3) the termination method must be compatible with spring terminal connections. If all three conditions are met, the substitute is functionally compatible.

Q: What is the impact of the 40 mA to 6 mA coil current difference?

A: The reduced coil current in RLY3-HAND1 decreases power dissipation in the control circuit by approximately 85%, reducing thermal load and improving energy efficiency. This does not affect load-side performance but may require verification of control circuit current-limiting components.

Q: Why does the operate time differ between the two relays?

A: The main part operates at 50 ms while the substitute operates at 10 ms. This represents a faster response characteristic in the substitute. Applications with timing-dependent logic must verify that faster relay response does not create unintended circuit behavior.

Q: Are there compatibility concerns with DIN Rail mounting?

A: Both relays use DIN Rail mounting, ensuring mechanical compatibility. However, the termination style change from screw to spring terminal requires appropriate wiring connection methods and may affect installation procedures.

Q: What certifications apply to the substitute part?

A: RLY3-HAND1 is ROHS3 compliant and REACH unaffected, meeting current environmental regulations for electronic components in industrial applications.