Equivalent & Substitute Parts for CMA4825 Solid State Relay

Part Overview

The CMA4825 is a Solid State SPST-NO (1 Form A) relay manufactured by Sensata-Crydom, designed for AC load switching applications. This component features a hockey puck form factor with screw terminal connections and is rated for 25A load current across a 48V to 530V range with 90-140VAC input control voltage. The CMA4825 is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for existing applications.

Key Parameters

Parameter	CMA4825 Specification
Manufacturer	Sensata-Crydom
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, Zero Cross
Load Current Rating	25 A
Input Voltage Range	90 ~ 140 VAC
Load Voltage Range	48 V ~ 530 V
Mounting Type	Chassis Mount
Package / Case	Hockey Puck
Termination Style	Screw Terminal
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CMA4825 is determined by the following critical parameters:

Circuit Configuration: All substitutes must maintain SPST-NO (1 Form A) topology
Load Current Rating: All substitutes must support 25A continuous current
Output Type: All substitutes must provide AC output with zero-cross switching
Package / Case: All substitutes must use hockey puck form factor
Termination Style: All substitutes must feature screw terminal connections
Mounting Type: All substitutes must support chassis mount installation
RoHS Compliance: All substitutes must maintain RoHS compliance status

The three active substitute parts (HA4825, CWA4825, and 84137111) meet these core requirements. Substitution compatibility is determined by load voltage range compatibility with the application circuit.

Parameter Comparison

Parameter	CMA4825	HA4825	CWA4825	84137111
Manufacturer	Sensata-Crydom	Sensata-Crydom	Sensata-Crydom	Sensata-Crydom
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	25 A	25 A	25 A	25 A
Input Voltage Range	90 ~ 140 VAC	90 ~ 280 VAC	90 ~ 280 VAC	90 ~ 280 VAC
Load Voltage Range	48 V ~ 530 V	48 V ~ 530 V	48 V ~ 660 V	48 V ~ 660 V
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	Hockey Puck	Hockey Puck	Hockey Puck	Hockey Puck
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts (HA4825, CWA4825, and 84137111) are active products with current manufacturing status and RoHS compliance certification, providing long-term supply chain stability compared to the obsolete CMA4825.

HA4825 maintains identical load voltage range (48V ~ 530V) to the CMA4825 and is the direct functional equivalent. This part is suitable for applications requiring no load voltage range expansion.

CWA4825 and 84137111 extend the maximum load voltage range to 660V while maintaining all other electrical and mechanical specifications. These parts are suitable for applications where expanded load voltage capability provides design flexibility or future-proofing.

All substitute parts support expanded input voltage range (90 ~ 280VAC) compared to the original CMA4825 (90 ~ 140VAC), enabling operation across broader control voltage conditions.

Frequently Asked Questions (FAQ)

Q: Can HA4825 be used as a direct replacement for CMA4825? A: Yes. The HA4825 maintains identical load voltage range (48V ~ 530V), circuit configuration, current rating, and package form factor. Both components are SPST-NO relays with 25A capacity and screw terminal connections.

Q: What is the difference between HA4825 and CWA4825? A: The primary difference is load voltage range. HA4825 supports 48V ~ 530V, while CWA4825 supports 48V ~ 660V. Both maintain identical 25A current rating, SPST-NO configuration, and hockey puck package. CWA4825 provides extended voltage capability for applications requiring higher load voltage switching.

Q: Why do the substitute parts have wider input voltage ranges? A: The substitute parts (HA4825, CWA4825, 84137111) support 90 ~ 280VAC input range compared to the CMA4825's 90 ~ 140VAC range. This expanded input voltage specification is a design improvement in the active product lines and does not affect compatibility with applications designed for the original 90 ~ 140VAC range.

Q: Are all substitute parts RoHS compliant? A: Yes. All three substitute parts (HA4825, CWA4825, and 84137111) are RoHS compliant, maintaining environmental compliance requirements.

Q: What is the difference between 84137111 and CWA4825? A: Both parts support identical electrical specifications (25A, 48V ~ 660V load range, SPST-NO configuration). The primary difference is series designation (GN series for 84137111 versus CW48 series for CWA4825) and moisture sensitivity level classification. Both are active products suitable for substitution.

Q: Can I use CWA4825 or 84137111 in an application designed for CMA4825? A: Yes. Both parts maintain the required SPST-NO circuit configuration, 25A current rating, hockey puck package, and screw terminal connections. The extended load voltage range (48V ~ 660V) is backward compatible with applications operating within the original 48V ~ 530V range.

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