Sensata-Crydom 4D2440 SSR Relay Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom 4D2440 is a solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 40A load current at 24-280V AC output. This component features a hockey puck form factor with screw terminal connections and zero-cross switching capability. The 4D2440 is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations. The D2450 serves as a direct manufacturer substitute with enhanced current rating and active product status.

Substiute Parts

4D2440

Sensata-CrydomIn Stock: 10444D2440 Datasheet

Current PartRFQ

D2450

Sensata-CrydomIn Stock: 1058D2450 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The D2450 qualifies as a direct substitute for the 4D2440 based on the following critical parameters:

• Circuit Configuration: Both parts maintain identical SPST-NO (1 Form A) topology
• Output Type: Both feature AC output with zero-cross switching
• Input Voltage Range: Both accept 3 ~ 32VDC control input
• Load Voltage Range: Both operate across 24 V ~ 280 V
• Mounting Type: Both use chassis mount configuration
• Package / Case: Both employ hockey puck form factor
• Termination Style: Both utilize screw terminal connections
• Series: Both belong to Series 1

The D2450 provides enhanced current capacity (50A versus 40A), making it suitable for applications requiring the 4D2440's electrical and mechanical specifications with additional current headroom. The D2450 maintains active product status and current compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The D2450 is the appropriate substitute for the obsolete 4D2440 in applications requiring SPST-NO solid-state relay functionality within the specified voltage and current parameters. The D2450 maintains all critical electrical and mechanical compatibility while offering:

• Active product status ensuring continued availability and supply chain support
• Enhanced ROHS3 compliance meeting current regulatory requirements
• REACH compliance status for European market applications
• Increased current capacity (50A) providing design margin for the 40A application requirement

Selection of the D2450 eliminates obsolescence risk while maintaining functional equivalence across all specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the D2450 directly replace the 4D2440 in existing applications?

A: Yes. The D2450 maintains identical circuit configuration, input/output voltage ranges, mounting type, package form factor, and termination style. The increased current rating (50A versus 40A) provides additional capacity without affecting compatibility.

Q: What is the primary reason for substitution?

A: The 4D2440 is classified as obsolete. The D2450 provides functional equivalence with active product status and current compliance certifications.

Q: Are there any mechanical differences between these parts?

A: No. Both parts use hockey puck form factor with screw terminal connections and chassis mount configuration, ensuring identical mechanical fit and installation requirements.

Q: What compliance differences exist between the parts?

A: The 4D2440 carries RoHS Compliant status. The D2450 meets ROHS3 Compliant and REACH Affected standards, reflecting current regulatory requirements.

Q: Is the higher current rating of the D2450 a concern for 40A applications?

A: No. The D2450's 50A rating is a superset of the 4D2440's 40A specification. Applications designed for 40A operation remain within the D2450's rated capacity.