CTD2425 Solid State Relay SPST-NO 25A 24-280V Equivalent & Substitute Parts

Part Overview

The CTD2425 is a solid state relay (SSR) manufactured by Sensata-Crydom, configured as a single-pole single-throw normally open (SPST-NO) device rated for 25A load current across 24V to 280V AC output. The device features a hockey puck form factor with screw terminal connections and zero-cross switching capability. The CTD2425 is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing system support and new designs.

Key Parameters

Parameter	Value
Circuit Configuration	SPST-NO (1 Form A)
Load Current Rating	25 A
Load Voltage Range	24 V – 280 V AC
Input Voltage Range	3.5 – 15 VDC (CTD2425)
Output Type	AC, Zero Cross
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Package / Case	Hockey Puck

Substitute Part Grouping Explanation

Substitution of the CTD2425 is determined by equivalence across the following critical parameters: circuit configuration (SPST-NO), load current rating (25A), load voltage range (24V–280V AC), output type (AC with zero-cross switching), mounting type (chassis mount), termination style (screw terminal), and physical form factor (hockey puck). All substitute parts listed maintain these specifications. Input voltage ranges vary among substitutes but remain within acceptable control signal levels (3–32 VDC). Compliance certifications, product status, and packaging configurations differ among substitutes and are detailed in the parameter comparison table.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Input Voltage	Load Voltage	Load Current	Output Type	RoHS Status	REACH Status
CTD2425	Sensata-Crydom	CT	Obsolete	3.5–15 VDC	24–280 V	25 A	AC, Zero Cross	Not Specified	REACH Unaffected
84134910	Sensata-Crydom	GNA5	Active	3–32 VDC	24–280 V	25 A	AC	ROHS3 Compliant	REACH Affected
CSW2425	Sensata-Crydom	CSW	Last Time Buy	3–32 VDC	24–280 V	25 A	AC, Zero Cross	ROHS3 Compliant	REACH Affected
D2425	Sensata-Crydom	1	Active	3–32 VDC	24–280 V	25 A	AC, Zero Cross	ROHS3 Compliant	REACH Affected
SSR-240D25	TE Connectivity Potter & Brumfield Relays	SSR	Active	3–32 VDC	24–280 V	25 A	AC, Zero Cross	ROHS3 Compliant	REACH Affected
SSRT-240D25	TE Connectivity Potter & Brumfield Relays	SSRT	Active	3–32 VDC	24–280 V	25 A	AC, Zero Cross	ROHS3 Compliant	REACH Affected

Engineering Selection Recommendations

For applications requiring direct functional replacement of the obsolete CTD2425, the D2425 (Sensata-Crydom, Series 1) is the primary substitute. This part maintains identical electrical specifications, zero-cross output switching, and is classified as active product status with ROHS3 compliance and REACH affected designation.

The CSW2425 (Sensata-Crydom, Series CSW) provides equivalent functionality with zero-cross switching and ROHS3 compliance but carries a Last Time Buy product status, indicating limited future availability.

The SSR-240D25 and SSRT-240D25 (TE Connectivity Potter & Brumfield Relays) are manufacturer-recommended alternatives that maintain all critical electrical parameters and zero-cross switching capability. Both are active products with ROHS3 compliance.

The 84134910 (Sensata-Crydom, Series GNA5) is functionally equivalent but specifies AC output type without explicit zero-cross designation. This part is active and ROHS3 compliant.

All substitute parts maintain the hockey puck form factor, screw terminal configuration, and chassis mount design required for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the CTD2425 be directly replaced with any of the listed substitutes?

A: Yes. All listed parts maintain the SPST-NO circuit configuration, 25A load current rating, 24–280V load voltage range, hockey puck form factor, screw terminal termination, and chassis mount design. Electrical and mechanical compatibility is established across all substitutes.

Q: What is the difference between parts with "AC, Zero Cross" output and "AC" output?

A: Zero-cross switching synchronizes relay activation to the zero-crossing point of the AC waveform, reducing electromagnetic interference and switching transients. Parts specified as "AC, Zero Cross" (CTD2425, CSW2425, D2425, SSR-240D25, SSRT-240D25) include this feature. The 84134910 specifies AC output without explicit zero-cross designation.

Q: Are there compliance differences among the substitutes?

A: The CTD2425 is REACH Unaffected. All substitute parts are REACH Affected. The CSW2425 carries Last Time Buy status, indicating limited future availability. The D2425, 84134910, SSR-240D25, and SSRT-240D25 are classified as active products. All substitutes except CTD2425 are ROHS3 compliant.

Q: What is the input voltage range difference, and does it affect substitution?

A: The CTD2425 accepts 3.5–15 VDC input. All substitutes accept 3–32 VDC input, providing broader control signal compatibility. This expanded range does not prevent substitution; it represents an enhancement in flexibility for control circuit design.

Q: Which substitute offers the best long-term availability?

A: The D2425, SSR-240D25, and SSRT-240D25 are all classified as active products, indicating ongoing manufacturing and availability. The CSW2425 is Last Time Buy, and the 84134910 is active but from a different series.

Q: Are all substitutes available in the same packaging configuration?

A: All substitutes are supplied in bulk packaging. The CTD2425 original specification does not indicate packaging type. Packaging configuration should be verified against procurement requirements.

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