HD4875 Solid State Relay SPST-NO 75A Equivalent & Substitute Parts

Part Overview

The HD4875 is a solid state relay (SSR) manufactured by Sensata-Crydom, designed for AC load switching applications requiring high current capacity. This SPST-NO (Single Pole Single Throw - Normally Open) relay operates as a 1 Form A configuration with zero-cross switching capability, rated for 75A load current across a 48V to 530V operating range. The part is currently active in production and maintains full RoHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring compatible switching performance and electrical specifications.

Substiute Parts

HD4875

Sensata-CrydomIn Stock: 822HD4875 Datasheet

Current PartRFQ

84134130

Sensata-CrydomIn Stock: 114484134130 Datasheet

DirectRFQ

84137130N

CrouzetIn Stock: 94384137130N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HD4875 is determined by strict equivalence across the following critical parameters:

Load Current: All substitute parts must maintain the 75A rating to ensure thermal and electrical performance parity.

Circuit Configuration: All substitutes must retain SPST-NO (1 Form A) topology to preserve switching functionality.

Output Type: AC output with zero-cross switching capability is mandatory for all substitutes.

Mounting and Termination: Chassis mount configuration with screw terminal termination ensures mechanical and electrical interface compatibility.

Package Form Factor: Hockey Puck package standardization allows direct physical replacement.

Input Voltage Range: Substitute parts must accommodate the control signal voltage range of 3 ~ 32VDC or higher minimum thresholds.

Load Voltage Range: Substitute parts must support the minimum 48V load voltage. Load voltage maximums of 530V or higher are acceptable.

The identified substitutes meet these criteria while maintaining active product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

HD4875 (Sensata-Crydom): Primary selection for applications requiring load voltage operation up to 530V. Maintains the lowest input voltage threshold at 3VDC minimum, providing maximum control signal flexibility. RoHS3 compliant and REACH affected. Active production status ensures long-term availability.

84134130 (Sensata-Crydom): Direct manufacturer alternative within the Sensata-Crydom product line. Supports extended load voltage operation to 660V, suitable for higher voltage applications. Input voltage minimum of 4VDC is functionally equivalent for most control circuits. RoHS3 compliant and REACH affected. Active production status.

84137130N (Crouzet): Cross-manufacturer substitute from Crouzet, functionally equivalent across all critical switching parameters. Supports 660V maximum load voltage. Input voltage specification matches 84134130 at 4VDC minimum. RoHS compliant (non-3 designation) and REACH unaffected. Active production status. Packaging supplied in Box format rather than Bulk.

All three parts maintain identical load current capacity (75A), circuit topology (SPST-NO), and zero-cross AC switching functionality. Selection between substitutes should prioritize application-specific load voltage requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the 84134130 replace the HD4875 in all applications?

A: The 84134130 is electrically compatible for applications operating at load voltages up to 530V. The extended voltage rating to 660V provides additional operational margin. The input voltage minimum increases from 3VDC to 4VDC; verify control signal voltage compatibility in your circuit design.

Q: What is the difference between RoHS3 and RoHS compliance?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. RoHS3 represents the current regulatory standard. The 84137130N carries RoHS compliance without the "3" designation. Both are acceptable for RoHS-regulated applications; verify specific regulatory requirements for your end market.

Q: Is the 84137130N (Crouzet) a direct physical replacement?

A: Yes. The 84137130N maintains identical Hockey Puck form factor, chassis mount configuration, and screw terminal termination. Physical installation is compatible. Packaging format differs (Box vs. Bulk), which may affect receiving and storage procedures.

Q: Why does the HD4875 have a lower input voltage minimum (3VDC vs. 4VDC)?

A: The HD4875 specifies a 3VDC minimum input threshold, providing broader control signal compatibility. The 84134130 and 84137130N specify 4VDC minimum. For control circuits operating between 3VDC and 4VDC, the HD4875 is the required selection.

Q: Are all three parts REACH compliant?

A: The HD4875 and 84134130 are REACH Affected. The 84137130N is REACH Unaffected. Verify REACH compliance requirements for your specific application and end market before selection.

Q: What load voltage range should I use for part selection?

A: The HD4875 operates to 530V maximum load voltage. The 84134130 and 84137130N extend to 660V. Select based on your application's actual load voltage requirements. All three parts support the minimum 48V load voltage threshold.