UE48-3OS3D2 Equivalent & Substitute Parts

Part Overview

The UE48-3OS3D2 is a safety relay manufactured by SICK, Inc., configured as a 3PST-NO (3 Form A) contact relay with 6A switching capacity at 24VAC/DC coil voltage. This component is classified as obsolete, necessitating identification of active equivalent models to maintain system functionality and ensure continued availability for new installations and field replacements.

Substiute Parts

UE48-3OS3D2

SICK, Inc.In Stock: 986UE48-3OS3D2 Datasheet

Current PartRFQ

RLY3-EMSS300

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

MFR RecommendedRFQ

RLY3-OSSD300

SICK, Inc.In Stock: 1134RLY3-OSSD300 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UE48-3OS3D2 is based on the following critical parameters that must align between the main part and substitute candidates:

• Contact Form: Both substitutes maintain 3PST-NO (3 Form A) configuration, ensuring identical switching topology
• Contact Rating (Current): Both substitutes are rated at 6 A, matching the load-switching capacity
• Coil Voltage: Both substitutes operate at 24VDC, compatible with the original 24VAC/DC specification
• Switching Voltage: Both substitutes support 230VAC, 230VDC maximum, within the operational envelope of the original part
• Mounting Type: Both substitutes use DIN Rail mounting, maintaining mechanical compatibility
• Contact Material: Both substitutes use Silver (Ag) and Gold (Au), preserving contact reliability characteristics

The substitute parts RLY3-EMSS300 and RLY3-OSSD300 are manufacturer-recommended equivalents with active product status, ensuring long-term availability and support.

Parameter Comparison

Engineering Selection Recommendations

Both RLY3-EMSS300 and RLY3-OSSD300 are active products from SICK, Inc., providing assured long-term availability compared to the obsolete UE48-3OS3D2. Both substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

The substitute parts demonstrate improved operational characteristics, including reduced operate time (12 ms versus 25 ms) and significantly lower coil current draw (6 mA versus 70 mA), resulting in reduced power consumption and faster response in safety-critical applications.

Termination style differs between the original part (screw terminal) and substitutes (spring terminal). System integration must account for this mechanical interface change during installation.

Frequently Asked Questions (FAQ)

Q: Can RLY3-EMSS300 and RLY3-OSSD300 directly replace UE48-3OS3D2 in existing installations?

A: Both substitutes maintain identical contact form (3PST-NO), current rating (6 A), coil voltage (24VDC), and switching voltage specifications. Mechanical compatibility requires verification of termination style differences; the substitutes use spring terminals rather than screw terminals.

Q: What are the key differences between the substitute parts?

A: RLY3-EMSS300 and RLY3-OSSD300 share identical electrical specifications, coil current, operate time, and contact ratings. The difference lies in the base product series designation (RLY3-E versus RLY3-O), reflecting internal design variations within the SICK ReLy product family.

Q: Are the substitute parts suitable for the same switching voltage applications?

A: Both substitutes support 230VAC and 230VDC maximum switching voltage. The original part specification included 300VDC maximum; applications requiring switching above 230VDC require engineering review.

Q: What compliance certifications apply to the substitute parts?

A: Both RLY3-EMSS300 and RLY3-OSSD300 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component procurement.