Equivalent & Substitute Parts for D2440 Solid State Relay

Part Overview

The D2440 is a Solid State Relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (Single Pole Single Throw - Normally Open) device in a Hockey Puck package. This relay operates with AC output featuring zero-cross switching capability, designed for chassis mount applications with screw terminal connections. The D2440 is an active product with ROHS3 compliance and REACH affected status. Alternative models become necessary when inventory constraints exist, when load current requirements exceed 40A, or when operating voltage ranges differ from the specified 24V to 280V load voltage window.

Key Parameters

Parameter	D2440 Specification
Manufacturer	Sensata-Crydom
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, Zero Cross
Input Voltage Range	3 ~ 32VDC
Load Voltage Range	24 V ~ 280 V
Load Current Rating	40 A
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Package Type	Hockey Puck
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the D2440 is determined by the following critical parameters: circuit configuration (SPST-NO), output type (AC with zero-cross switching), package form factor (Hockey Puck), mounting method (Chassis Mount), and termination style (Screw Terminal). Load current capacity and voltage ranges define the operational envelope within which substitutes function. The D2440 operates at 40A with a load voltage range of 24V to 280V and input voltage of 3V to 32VDC.

Two substitute parts meet the core functional requirements:

SSR-240D50 (TE Connectivity Potter & Brumfield Relays): Maintains identical circuit configuration, output type, package, mounting, and termination. Load current capacity increases to 50A while load voltage range remains 24V to 280V. Input voltage range expands to 4V to 32VDC.

84137450N (Crouzet): Maintains identical circuit configuration, output type, package, mounting, and termination. Load current capacity remains at 40A. Load voltage range expands to 48V to 660V, accommodating higher voltage applications. Input voltage range is 4V to 32VDC.

Parameter Comparison

Parameter	D2440 (Sensata-Crydom)	SSR-240D50 (TE Connectivity)	84137450N (Crouzet)
Circuit Configuration	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
Input Voltage Range	3 ~ 32VDC	4 ~ 32VDC	4 ~ 32VDC
Load Voltage Range	24 V ~ 280 V	24 V ~ 280 V	48 V ~ 660 V
Load Current Rating	40 A	50 A	40 A
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal
Package Type	Hockey Puck	Hockey Puck	Hockey Puck
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
REACH Status	REACH Affected	REACH Affected	REACH Unaffected

Engineering Selection Recommendations

All three parts maintain active product status and comply with applicable environmental regulations. The D2440 and SSR-240D50 both carry ROHS3 compliance with REACH affected status. The 84137450N carries RoHS compliance with REACH unaffected status, making it suitable for applications with REACH-sensitive supply chain requirements.

Selection between substitutes depends on application requirements:

SSR-240D50 is appropriate when load current capacity must exceed 40A while maintaining the original 24V to 280V load voltage specification. The expanded input voltage floor to 4VDC (from 3VDC) has negligible impact on most control circuits.

84137450N is appropriate when load voltage requirements exceed 280V, extending operation to 660V maximum. This part maintains the 40A current rating and is preferred in REACH-unaffected supply chains.

Frequently Asked Questions (FAQ)

Q: Can SSR-240D50 directly replace D2440 in existing designs? A: Yes. SSR-240D50 maintains identical load voltage range (24V to 280V), circuit configuration, package, and termination. The increased current rating (50A vs 40A) and marginally higher input voltage floor (4VDC vs 3VDC) do not create incompatibility.

Q: Can 84137450N directly replace D2440 in existing designs? A: Yes, provided the load voltage does not exceed 280V. The 84137450N supports load voltages up to 660V, making it compatible with D2440 applications operating within the 24V to 280V range. Current rating remains at 40A.

Q: What is the primary difference between the two substitutes? A: SSR-240D50 increases load current capacity to 50A while maintaining the original voltage range. 84137450N extends maximum load voltage to 660V while maintaining 40A current capacity.

Q: Are all three parts compatible with the same control voltage? A: All three parts accept input voltage in the 4V to 32VDC range. The D2440 accepts 3V minimum, providing marginally broader input compatibility, though this difference is rarely significant in practice.

Q: Do package and mounting differences exist between these parts? A: No. All three parts use Hockey Puck packaging with chassis mount configuration and screw terminal termination, ensuring mechanical and electrical interface compatibility.

Q: Which substitute should be selected for new designs? A: Selection depends on application load voltage and current requirements. For applications requiring current above 40A, use SSR-240D50. For applications requiring load voltage above 280V, use 84137450N. For standard 24V to 280V, 40A applications, any part is suitable based on availability and supply chain compliance requirements.

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