Equivalent & Substitute Parts for D4840 Solid State Relay

Part Overview

The D4840 is a Solid State SPST-NO (1 Form A) relay manufactured by Sensata-Crydom, designed for AC load switching applications with zero-cross detection. This hockey puck-style relay operates with a 3–32 VDC input and handles loads from 80–530 V at 40 A. The part is currently active in production with ROHS3 compliance and REACH affected status. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when application requirements align with compatible electrical and mechanical specifications.

Key Parameters

Parameter	D4840 Specification
Manufacturer	Sensata-Crydom
Series	D48
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, Zero Cross
Input Voltage Range	3–32 VDC
Load Voltage Range	80–530 V
Load Current	40 A
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Package / Case	Hockey Puck
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the D4840 is determined by the following critical parameters:

Circuit Configuration: All substitutes must maintain SPST-NO (1 Form A) topology
Output Type: AC output with zero-cross detection is required
Mounting Type: Chassis mount with hockey puck package is mandatory
Termination Style: Screw terminal connection is required
Load Current Capability: Minimum 40 A at rated load voltage
Load Voltage Range: Must encompass or exceed the 80–530 V operating window
Input Voltage Compatibility: Must accept 3–32 VDC control signal

Four substitute parts meet these criteria with variations in load current rating (40 A or 50 A) and load voltage upper limits (530 V or 660 V). All substitutes maintain the same circuit topology, output type, mounting configuration, and termination style as the primary part.

Parameter Comparison

Parameter	D4840	84134120	84137450N	ASR-SI480D40ZW-L	SSR-480D50
Manufacturer	Sensata-Crydom	Sensata-Crydom	Crouzet	Altran Magnetics, LLC	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)	SPST-NO (1 Form A)
Output Type	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross
Input Voltage Range	3–32 VDC	4–32 VDC	4–32 VDC	4–32 VDC	4–32 VDC
Load Voltage Range	80–530 V	48–660 V	48–660 V	48–530 V	48–660 V
Load Current	40 A	50 A	40 A	40 A	50 A
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
Package / Case	Hockey Puck	Hockey Puck	Hockey Puck	Hockey Puck	Hockey Puck
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

All four substitute parts are active products with established compliance certifications. Selection between substitutes depends on specific application constraints:

84134120 (Sensata-Crydom): Rated for 50 A load current with 48–660 V range. Maintains manufacturer continuity with ROHS3 compliance and REACH affected status. Suitable for applications requiring higher current capacity within the same manufacturer ecosystem.

84137450N (Crouzet): Rated for 40 A load current with 48–660 V range. Offers REACH unaffected status, which may be advantageous for applications subject to REACH regulatory constraints. RoHS compliant but not ROHS3 certified.

ASR-SI480D40ZW-L (Altran Magnetics, LLC): Rated for 40 A load current with 48–530 V range. Maintains the exact load voltage upper limit of the primary part (530 V) and provides REACH unaffected status. ROHS3 compliant. Direct electrical equivalent with alternative sourcing.

SSR-480D50 (TE Connectivity Potter & Brumfield Relays): Rated for 50 A load current with 48–660 V range. ROHS3 compliant with REACH affected status. Provides higher current capacity and extended voltage range for applications requiring increased thermal headroom.

Frequently Asked Questions (FAQ)

Q: Can I use a 50 A rated substitute in place of the 40 A D4840?

A: Yes. The 50 A substitutes (84134120 and SSR-480D50) are rated for higher load current and are electrically compatible. The higher current rating does not degrade performance in 40 A applications; it provides additional margin.

Q: What is the significance of the input voltage range difference (3–32 VDC vs. 4–32 VDC)?

A: The D4840 accepts input signals as low as 3 VDC, while all substitutes require a minimum of 4 VDC. Applications using control signals below 4 VDC must use the original D4840 part.

Q: Are there load voltage compatibility concerns?

A: The D4840 operates from 80–530 V. Substitutes with 48–660 V ranges are compatible for all D4840 applications. The ASR-SI480D40ZW-L matches the 530 V upper limit exactly. Applications operating below 80 V load voltage require verification against substitute minimum ratings.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 represents the current RoHS Directive 2011/65/EU with amendments. The 84137450N is RoHS compliant but not explicitly ROHS3 certified. For applications requiring current RoHS certification, ROHS3-compliant parts are preferred.

Q: Does REACH affected or unaffected status impact substitution?

A: REACH status indicates regulatory obligations for substance reporting. REACH affected parts (D4840, 84134120, SSR-480D50) require REACH compliance documentation. REACH unaffected parts (84137450N, ASR-SI480D40ZW-L) do not. Selection depends on supply chain and regulatory requirements.

Q: Can I mix substitute parts in the same application or system?

A: All substitutes are electrically and mechanically compatible with the D4840 and with each other. System design should account for the specific electrical characteristics of the selected part, particularly load voltage range and current rating.

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