Sensata-Crydom D1240 Solid State Relay SPST-NO 40A 24-140V Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom D1240 is a solid state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 40A load current at 24-140V AC output with zero-cross switching. The device features a hockey puck form factor with screw terminal connections and is designed for chassis mount applications. This part is active in production and ROHS3 compliant. Equivalent and substitute parts are identified based on matching circuit topology, output type, termination style, and package form factor while accommodating variations in load current and voltage ratings within acceptable operational parameters.

Key Parameters

Parameter	D1240 Specification
Manufacturer	Sensata-Crydom
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, Zero Cross
Load Current Rating	40 A
Load Voltage Range	24 V ~ 140 V
Input Voltage Range	3 ~ 32 VDC
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Package / Case	Hockey Puck
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the D1240 are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Circuit configuration: SPST-NO (1 Form A)
Output type: AC with zero-cross switching
Termination style: Screw terminal
Package form factor: Hockey puck
Mounting type: Chassis mount

Allowable Variations:

Load current rating: Substitutes may exceed the 40A rating (50A acceptable)
Load voltage range: Substitutes may exceed the 24-140V range (extended ranges acceptable)
Input voltage range: Substitutes may vary within 3-32VDC envelope
Manufacturer: Cross-manufacturer substitution permitted when all primary criteria are met

Three substitute parts meet these criteria: Sensata-Crydom 84134020, Crouzet 84137450N, and TE Connectivity Potter & Brumfield SSR-240D50.

Parameter Comparison

Parameter	D1240 (Main)	84134020 (Sensata-Crydom)	84137450N (Crouzet)	SSR-240D50 (TE Connectivity)
Manufacturer	Sensata-Crydom	Sensata-Crydom	Crouzet	TE Connectivity Potter & Brumfield Relays
Circuit Configuration	SPST-NO (1 Form A)	SPST-NO (1 Form A)	SPST-NO (1 Form A)	SPST-NO (1 Form A)
Output Type	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross
Load Current Rating	40 A	50 A	40 A	50 A
Load Voltage Range	24 V ~ 140 V	24 V ~ 280 V	48 V ~ 660 V	24 V ~ 280 V
Input Voltage Range	3 ~ 32 VDC	3 ~ 32 VDC	4 ~ 32 VDC	4 ~ 32 VDC
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
Package / Case	Hockey Puck	Hockey Puck	Hockey Puck	Hockey Puck
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Packaging	Bulk	Bulk	Box	Bulk

Engineering Selection Recommendations

All three substitute parts are active products with current manufacturing status. Selection between D1240 and substitute parts depends on application voltage and current requirements:

Sensata-Crydom 84134020: Maintains manufacturer continuity with same-source supply. Rated for 50A load current and extended 24-280V range. ROHS3 compliant. Suitable for applications requiring higher current capacity or extended voltage range within the same manufacturer ecosystem.

Crouzet 84137450N: Provides cross-manufacturer alternative with highest voltage range (48-660V). Maintains 40A current rating matching the D1240. RoHS compliant. Suitable for high-voltage applications exceeding 140V load voltage. Input voltage range begins at 4VDC (versus 3VDC for D1240).

TE Connectivity Potter & Brumfield SSR-240D50: Cross-manufacturer option with 50A current rating and 24-280V load voltage range. ROHS3 compliant. Provides higher current capacity with extended voltage capability. Input voltage range begins at 4VDC.

All substitute parts maintain identical circuit topology, output switching characteristics, termination style, and package form factor as the D1240.

Frequently Asked Questions (FAQ)

Q: Can I use the 84134020 as a direct replacement for the D1240?

A: Yes. The 84134020 maintains identical circuit configuration, output type, termination style, and package form factor. The higher 50A current rating and extended 24-280V voltage range provide backward compatibility for D1240 applications operating within the original 24-140V specification.

Q: What is the primary difference between the Crouzet 84137450N and the D1240?

A: The 84137450N extends the load voltage range to 48-660V, making it suitable for higher-voltage applications. Both maintain 40A current rating and identical switching characteristics. The input voltage range begins at 4VDC instead of 3VDC.

Q: Are all substitute parts ROHS compliant?

A: Yes. The D1240, 84134020, and SSR-240D50 are ROHS3 compliant. The Crouzet 84137450N is RoHS compliant.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Bulk versus Box) does not affect electrical specifications or functional compatibility. Selection is based on procurement and inventory requirements.

Q: Can I substitute the D1240 in an application requiring 48V load voltage?

A: The D1240 is rated for 24-140V load voltage, which includes 48V operation. All substitute parts also support 48V operation, with the Crouzet 84137450N extending capability to 660V.

Q: What is the minimum input voltage for each part?

A: D1240, 84134020: 3VDC minimum. Crouzet 84137450N, TE Connectivity SSR-240D50: 4VDC minimum. Verify application input voltage compatibility before selection.

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