Sensata-Crydom 4D1240 SSR Relay Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom 4D1240 is a solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 40A load current at 24V to 140V AC output. This component features a hockey puck form factor with screw terminal connections and zero-cross switching capability. The 4D1240 is classified as obsolete, making identification of active equivalent parts essential for ongoing system support and procurement planning.

Substiute Parts

4D1240

Sensata-CrydomIn Stock: 7224D1240 Datasheet

Current PartRFQ

D1240

Sensata-CrydomIn Stock: 1222D1240 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 4D1240 is determined by strict equivalence across the following electrical and mechanical parameters:

• Circuit configuration: SPST-NO (1 Form A)
• Output type: AC with zero-cross switching
• Input voltage range: 3 ~ 32VDC
• Load voltage range: 24 V ~ 140 V
• Load current rating: 40 A
• Termination style: Screw Terminal
• Package form factor: Hockey Puck
• Mounting type: Chassis Mount

The direct substitute D1240 maintains identical electrical specifications and physical form factor while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The D1240 is the direct functional equivalent of the 4D1240, offering identical electrical performance and mechanical compatibility. The transition from 4D1240 to D1240 is supported by:

• Active product status of D1240 ensures ongoing availability and manufacturer support
• ROHS3 compliance of D1240 aligns with current environmental regulations
• Identical electrical specifications eliminate circuit redesign requirements
• Matching form factor and termination style enable direct mechanical substitution
• Both parts maintain the same ECCN classification (EAR99)

Frequently Asked Questions (FAQ)

Q: Can D1240 be used as a direct replacement for 4D1240 in existing applications?

A: Yes. The D1240 maintains identical electrical specifications (40A at 24-140V AC output, 3-32VDC input), circuit configuration (SPST-NO), output type (AC zero-cross), and physical form factor (hockey puck with screw terminals). No circuit modifications are required.

Q: What is the primary reason for substituting 4D1240?

A: The 4D1240 is classified as obsolete. The D1240 is the active equivalent part from the same manufacturer, ensuring continued procurement availability and manufacturer support.

Q: Are there packaging differences between 4D1240 and D1240?

A: The 4D1240 packaging is listed as unspecified, while D1240 is supplied in bulk packaging. Both parts use identical hockey puck form factors and screw terminal connections.

Q: What compliance certifications apply to the D1240 substitute?

A: The D1240 is ROHS3 compliant and REACH affected. The original 4D1240 is REACH unaffected. Both parts carry the same ECCN classification (EAR99).

Q: Are the input and output voltage ranges identical between both parts?

A: Yes. Both 4D1240 and D1240 operate with 3-32VDC input and 24-140V AC load voltage ranges, with identical 40A current rating.