OSSRD0004A Solid State Relay - Equivalent & Substitute Parts

Part Overview

The OSSRD0004A is a solid state relay (SSR) manufactured by TT Electronics/Optek Technology, configured as a SPST-NO (Single Pole Single Throw - Normally Open) device with a 40A load capacity. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. The device operates with AC output featuring zero-cross switching capability and is housed in a hockey puck package with screw terminal connections.

Substiute Parts

OSSRD0004A

TT Electronics/Optek TechnologyIn Stock: 1266OSSRD0004A Datasheet

Current PartRFQ

D2440

Sensata-CrydomIn Stock: 3326D2440 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OSSRD0004A is determined by the following critical parameters:

• Circuit configuration must be SPST-NO (1 Form A)
• Output type must be AC with zero-cross switching
• Load current rating must be 40 A
• Package type must be hockey puck with screw terminal connections
• Input voltage range must accommodate 4 ~ 32 VDC operation
• Load voltage range must overlap with 50 V ~ 250 V specification
• Mounting type must be chassis mount

The D2440 from Sensata-Crydom meets all substitution criteria. This part maintains identical circuit topology, output characteristics, current rating, and physical packaging while offering an active product status and extended load voltage capability.

Parameter Comparison

Engineering Selection Recommendations

The D2440 is the qualified substitute for the OSSRD0004A based on the following engineering criteria:

Functional equivalence is established through identical circuit topology (SPST-NO), output switching characteristics (AC, zero-cross), current rating (40 A), and physical form factor (hockey puck with screw terminals). The D2440 maintains full compliance with ROHS3 requirements, matching the environmental and regulatory status of the original part.

The D2440 offers operational advantages through an extended input voltage range (3 ~ 32 VDC versus 4 ~ 32 VDC) and expanded load voltage capability (24 V ~ 280 V versus 50 V ~ 250 V). These extended ranges provide design flexibility while maintaining backward compatibility with the original OSSRD0004A specifications.

The active product status of the D2440 ensures long-term availability and supply chain continuity, addressing the obsolescence of the OSSRD0004A. Both parts are ROHS3 compliant and suitable for equivalent circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can the D2440 be used as a direct replacement for the OSSRD0004A in existing applications?

A: Yes. The D2440 maintains identical circuit configuration (SPST-NO), output type (AC, zero-cross), load current rating (40 A), and physical packaging (hockey puck with screw terminals). The input and load voltage ranges of the D2440 encompass the OSSRD0004A specifications, ensuring compatibility in applications designed for the original part.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer (TT Electronics/Optek Technology versus Sensata-Crydom) and product status (obsolete versus active). The D2440 provides extended input voltage range (3 ~ 32 VDC) and load voltage range (24 V ~ 280 V) compared to the OSSRD0004A. Both parts are ROHS3 compliant.

Q: Are there any packaging or mounting considerations when substituting the D2440 for the OSSRD0004A?

A: No. Both parts use identical hockey puck packaging with screw terminal connections and chassis mount configuration. Physical installation and electrical connection methods remain unchanged.

Q: Does the D2440 maintain the same switching characteristics?

A: Yes. Both parts feature AC output with zero-cross switching, ensuring identical switching behavior in AC load applications.

Q: What is the significance of the extended voltage ranges on the D2440?

A: The D2440 input range (3 ~ 32 VDC) and load range (24 V ~ 280 V) are supersets of the OSSRD0004A specifications. This provides design flexibility for applications requiring operation at the extended limits while maintaining full compatibility with the original part's operating window.