Sensata-Crydom A2440 SSR Relay SPST-NO 40A 24-280V Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom A2440 is an active solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 40A load current and 24-280V operation. This hockey puck-style relay is designed for chassis mount applications with screw terminal connections and AC zero-cross switching capability. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical form factor, and compliance certifications to support component procurement flexibility and supply chain continuity.

Substiute Parts

A2440

Sensata-CrydomIn Stock: 1115A2440 Datasheet

Current PartRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

SSR-240A50

TE Connectivity Potter & Brumfield RelaysIn Stock: 1159SSR-240A50 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A2440 are qualified based on the following electrical and mechanical parameters:

• Circuit Configuration: SPST-NO (1 Form A) topology must be maintained
• Output Type: AC zero-cross switching capability required
• Package / Case: Hockey puck form factor for mechanical compatibility
• Termination Style: Screw terminal connections for installation compatibility
• Mounting Type: Chassis mount orientation
• Load Current Rating: Minimum 40A or higher
• Load Voltage Range: Must encompass or exceed 24-280V specification
• Input Voltage Range: Must support 90-280VAC or compatible range
• RoHS Compliance: ROHS3 or equivalent environmental certification

Two substitute parts meet these criteria: the Crouzet 84137121N (50A, 48-660V load range) and the TE Connectivity Potter & Brumfield SSR-240A50 (50A, 24-280V load range). Both maintain identical circuit topology, package form factor, and termination style while offering equal or superior current ratings.

Parameter Comparison

Engineering Selection Recommendations

SSR-240A50 (TE Connectivity Potter & Brumfield Relays) is the primary substitute for the A2440. This part maintains identical input voltage range (90-280VAC), load voltage range (24-280V), and mounting specifications while providing 50A current capacity. Both parts carry ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

84137121N (Crouzet) is a secondary substitute option. While it provides 50A current capacity and maintains circuit topology and package form factor, its load voltage range (48-660V) exceeds the A2440 specification and its input voltage range (20-265VAC) differs slightly. This part is suitable for applications where the extended load voltage range provides design flexibility, though it introduces a minor input voltage specification variance.

Selection between SSR-240A50 and 84137121N depends on application voltage requirements. For circuits operating within 24-280V load range and 90-280VAC input range, SSR-240A50 provides direct parameter alignment. For applications requiring extended load voltage capability, 84137121N accommodates higher voltage loads while maintaining all mechanical and functional compatibility criteria.

Frequently Asked Questions (FAQ)

Q: Can the SSR-240A50 directly replace the A2440 in existing designs?

A: Yes. The SSR-240A50 maintains identical input voltage range (90-280VAC), load voltage range (24-280V), circuit configuration (SPST-NO), output type (AC zero-cross), package form factor (hockey puck), and termination style (screw terminal). The 50A current rating exceeds the 40A requirement, providing design margin.

Q: What is the key difference between the Crouzet 84137121N and the TE Connectivity SSR-240A50?

A: Both parts provide 50A current capacity and identical circuit topology. The primary difference is load voltage range: the 84137121N supports 48-660V while the SSR-240A50 supports 24-280V. For applications within the 24-280V range, SSR-240A50 provides direct specification alignment. The 84137121N is suitable when extended load voltage capability is required.

Q: Are all substitute parts RoHS compliant?

A: Yes. The A2440 is ROHS3 compliant, the SSR-240A50 is ROHS3 compliant, and the 84137121N is RoHS compliant. All parts meet environmental regulatory requirements.

Q: Do the substitute parts use the same hockey puck package and screw terminal connections?

A: Yes. All three parts—A2440, SSR-240A50, and 84137121N—use hockey puck form factor and screw terminal connections, ensuring mechanical compatibility with existing mounting and wiring infrastructure.

Q: What is the input voltage specification difference for the Crouzet 84137121N?

A: The Crouzet 84137121N supports 20-265VAC input range compared to the A2440's 90-280VAC range. This represents a lower minimum input voltage (20V vs. 90V) and slightly lower maximum input voltage (265V vs. 280V). For applications operating within the 90-265VAC window, both parts are compatible.