Sensata-Crydom 84137021 SSR Relay SPST-NO 50A Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom 84137021 is a solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 50A load current with AC zero-cross output capability. This hockey puck-style relay is designed for chassis mount applications requiring switching of AC loads in the 24V to 280V range with input control voltage from 90V to 280VAC. The part is currently active in production and RoHS compliant. Equivalent and substitute parts are identified to provide procurement flexibility, inventory alternatives, and continuity of supply for applications where the original part number may be unavailable.

Substiute Parts

84137021

Sensata-CrydomIn Stock: 102984137021 Datasheet

Current PartRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Sensata-Crydom 84137021 is determined by the following critical parameters:

• Circuit configuration must be SPST-NO (1 Form A)
• Load current rating must be 50A minimum
• Output type must be AC with zero-cross capability
• Package must be hockey puck form factor
• Termination must be screw terminal
• Mounting must be chassis mount compatible
• RoHS compliance status must be maintained

The substitute part 84137121N (Crouzet) meets these core substitution criteria. While the substitute part features an extended load voltage range (48V to 660V versus 24V to 280V) and different input voltage specification (20V to 265VAC versus 90V to 280VAC), these represent expanded operational capabilities that maintain backward compatibility with the original part's specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the Sensata-Crydom 84137021 and Crouzet 84137121N are active production parts with RoHS compliance certification. Selection between these parts should be based on application-specific voltage requirements. The original Sensata-Crydom part is suitable for applications requiring input control voltage within the 90V to 280VAC range and load switching in the 24V to 280V envelope. The Crouzet substitute provides compatibility for applications with lower input voltage requirements (down to 20VAC) and higher load voltage capability (up to 660V), while maintaining the same 50A current rating and zero-cross AC switching functionality. Both parts utilize identical hockey puck packaging and screw terminal termination, ensuring mechanical and electrical interchangeability within their respective voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the Crouzet 84137121N be used as a direct replacement for the Sensata-Crydom 84137021?

A: Yes, within the voltage operating range of the original application. The Crouzet part maintains identical circuit configuration (SPST-NO), load current rating (50A), output type (AC zero-cross), package form factor (hockey puck), and termination style (screw terminal). Verify that your application's input control voltage and load voltage requirements fall within the Crouzet part's specified ranges (20V to 265VAC input, 48V to 660V load).

Q: What are the key differences between these two parts?

A: The primary differences are input voltage range and load voltage range. The Sensata-Crydom 84137021 operates with input voltage from 90V to 280VAC and load voltage from 24V to 280V. The Crouzet 84137121N operates with input voltage from 20V to 265VAC and load voltage from 48V to 660V. Both parts share identical load current rating (50A), circuit configuration, output type, and physical packaging.

Q: Are both parts RoHS compliant?

A: Yes, both the Sensata-Crydom 84137021 and Crouzet 84137121N are RoHS compliant and suitable for applications requiring environmental compliance certification.

Q: What is the significance of the hockey puck package form factor?

A: The hockey puck package is a standardized industrial form factor for solid-state relays designed for chassis mount applications. Both parts utilize this identical package, ensuring mechanical compatibility and interchangeability in mounting hardware and thermal management configurations.

Q: Can I use the Crouzet part in an application designed for the Sensata-Crydom part if my load voltage is below 48V?

A: No. The Crouzet 84137121N specifies a minimum load voltage of 48V. If your application requires load switching below 48V, the original Sensata-Crydom 84137021 (minimum 24V) must be used.