Sensata Technologies A4850H Solid State Relay - Equivalent & Substitute Parts

Part Overview

The Sensata Technologies A4850H is an active SPST-NO (Single Pole Single Throw - Normally Open) solid state relay in Hockey Puck form factor, rated for 50A load current with AC output and zero-cross switching capability. This component is designed for chassis mount applications requiring AC load switching in the 48V to 530V range with 90-280VAC input control voltage. The part is RoHS compliant and actively manufactured. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific voltage range requirements.

Substiute Parts

A4850H

Sensata TechnologiesIn Stock: 930A4850H Datasheet

Current PartRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A4850H is determined by strict alignment of the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching logic
• Output Type: Must be AC with zero-cross switching to preserve load control characteristics
• Load Current Rating: Must be rated for minimum 50A continuous operation
• Package / Case: Must be Hockey Puck form factor to ensure mechanical fit in chassis mount applications
• Termination Style: Must use Screw Terminal for direct connection compatibility
• Mounting Type: Must support Chassis Mount installation

The Crouzet 84137121N meets all substitution criteria. While it features an extended load voltage range (48-660V versus 48-530V) and a lower input voltage minimum (20VAC versus 90VAC), these represent expanded operational capability rather than incompatibility. The input voltage range expansion provides greater flexibility in control circuit design, and the higher maximum load voltage rating ensures compatibility with all applications suitable for the A4850H.

Parameter Comparison

Engineering Selection Recommendations

Both the Sensata Technologies A4850H and Crouzet 84137121N are active products with RoHS compliance certification, ensuring regulatory alignment for current manufacturing and deployment. Selection between these parts should be based on application-specific requirements:

The A4850H remains the primary choice when the design is optimized for the 90-280VAC input range and 48-530V load range specifications.

The Crouzet 84137121N is a direct functional substitute suitable for applications where the extended input voltage range (20-265VAC) or expanded load voltage capability (48-660V) provides system design advantages. The lower input voltage minimum of 20VAC enables operation in lower-voltage control circuits, while the 660V maximum load rating accommodates higher-voltage switching applications within the same 50A current envelope.

Both parts maintain identical switching characteristics through SPST-NO configuration and zero-cross AC output control, ensuring equivalent performance in load switching applications.

Frequently Asked Questions (FAQ)

Q: Can the Crouzet 84137121N directly replace the Sensata A4850H in existing designs?

A: Yes. Both parts share identical circuit configuration (SPST-NO), output type (AC zero-cross), load current rating (50A), package form factor (Hockey Puck), and termination style (Screw Terminal). The Crouzet part's expanded voltage ranges represent additional capability rather than incompatibility.

Q: What is the significance of the different input voltage ranges?

A: The A4850H operates with 90-280VAC input control voltage, while the 84137121N operates with 20-265VAC input. The Crouzet part's lower minimum (20VAC) allows operation in lower-voltage control circuits. The A4850H's higher maximum (280VAC) supports higher-voltage control applications. Application requirements determine which range is appropriate.

Q: How do the load voltage ranges differ, and does this affect substitution?

A: The A4850H is rated for 48-530V load switching, while the 84137121N is rated for 48-660V. The Crouzet part's higher maximum load voltage (660V) means it can switch higher-voltage loads while maintaining the same 50A current rating. This represents expanded capability and does not restrict substitution in applications using the A4850H's voltage range.

Q: Are both parts suitable for chassis mount installation?

A: Yes. Both the A4850H and 84137121N are specified for Chassis Mount installation with Hockey Puck form factor and Screw Terminal connections, ensuring mechanical and electrical compatibility in the same mounting configuration.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant and actively manufactured, meeting current regulatory requirements for industrial and commercial applications.