HD4850S Solid State Relay SPST-NO 50A Equivalent & Substitute Parts

Part Overview

The HD4850S is an active Sensata-Crydom solid state relay (SSR) featuring SPST-NO (1 Form A) switching configuration in a hockey puck package. This component is designed for AC load switching applications with zero-cross detection, operating from 4–32VDC input control voltage and supporting load voltages from 48–530V at 50A continuous current. The part is RoHS compliant and carries unlimited moisture sensitivity rating (MSL 1), making it suitable for industrial control and power switching applications. Equivalent alternatives exist where specific load voltage or inventory requirements necessitate substitution while maintaining core switching functionality and electrical performance parameters.

Substiute Parts

HD4850S

Sensata-CrydomIn Stock: 976HD4850S Datasheet

Current PartRFQ

84138120N

CrouzetIn Stock: 95584138120N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HD4850S is determined by electrical and mechanical compatibility across 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 detection for synchronized switching
• Input Voltage Range: Must accommodate 4–32VDC control signals
• Load Current Rating: Must support minimum 50A continuous current
• Mounting and Termination: Must use chassis mount with screw terminal configuration
• Package Form Factor: Must be hockey puck package for mechanical fit
• Compliance: Must maintain RoHS compliance and MSL 1 rating

The Crouzet 84138120N meets all substitution criteria with one operational difference: load voltage range is 24–500V versus the HD4850S range of 48–530V. This represents a narrower minimum voltage specification (24V vs. 48V) and slightly reduced maximum voltage (500V vs. 530V), making it suitable for applications operating within the 24–500V window.

Parameter Comparison

Engineering Selection Recommendations

Both the HD4850S and 84138120N are active products with full RoHS compliance and unlimited moisture sensitivity ratings, qualifying them for equivalent use in industrial SSR applications. Selection between these parts is determined by load voltage requirements:

• HD4850S: Select for applications requiring load voltage operation from 48V to 530V, or where maximum voltage headroom is critical
• 84138120N: Select for applications operating within 24–500V load voltage range, or where Crouzet component standardization is preferred

Both parts maintain identical input control voltage (4–32VDC), load current capacity (50A), switching configuration (SPST-NO with zero-cross), and mechanical form factor (hockey puck, chassis mount, screw terminal). Compliance certifications are equivalent across both options.

Frequently Asked Questions (FAQ)

Q: Can the 84138120N replace the HD4850S in all applications?

A: The 84138120N is suitable for applications where the load voltage operates within 24–500V. If your application requires load voltages below 24V or above 500V, the HD4850S is required.

Q: What is the significance of the load voltage difference between these parts?

A: The HD4850S supports 48–530V while the 84138120N supports 24–500V. The HD4850S provides higher maximum voltage capability (530V vs. 500V) and higher minimum voltage threshold (48V vs. 24V). Applications operating at voltages below 48V or above 500V must use the HD4850S.

Q: Are the input control voltage ranges identical?

A: Yes. Both the HD4850S and 84138120N operate on 4–32VDC input control voltage, ensuring identical control circuit compatibility.

Q: Do both parts support the same load current?

A: Yes. Both parts are rated for 50A continuous load current with SPST-NO switching configuration and AC zero-cross output type.

Q: Are there differences in packaging or mounting?

A: No. Both parts use identical hockey puck package form factor, chassis mount configuration, and screw terminal termination style, ensuring mechanical interchangeability.

Q: What compliance certifications apply to both parts?

A: Both the HD4850S and 84138120N are RoHS compliant with MSL 1 (unlimited) moisture sensitivity rating. The 84138120N carries additional REACH Unaffected status.

Q: How do I determine which part to use?

A: Verify your application's load voltage requirement. If it falls within 24–500V, either part is acceptable. If your load voltage is below 24V or above 500V, use the HD4850S. Both parts are electrically and mechanically equivalent for all other parameters.