H12WD4850GH Solid State Relay - Equivalent & Substitute Parts

Part Overview

The H12WD4850GH is an active Sensata-Crydom solid state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 50A load current and 48-660V AC output voltage. This hockey puck-style chassis mount relay operates with 4-32VDC input control voltage and features zero-cross switching for AC loads. The part is RoHS compliant and carries MSL Level 1 (unlimited moisture sensitivity rating). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges.

Substiute Parts

H12WD4850GH

Sensata-CrydomIn Stock: 1146H12WD4850GH Datasheet

Current PartRFQ

84138120N

CrouzetIn Stock: 95584138120N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the H12WD4850GH is determined by the following critical parameters:

• Circuit configuration must be SPST-NO (1 Form A)
• Load current rating must be 50 A
• Output voltage range must encompass or be compatible with 48-660V AC operation
• Input voltage range must be compatible with 4-32VDC control
• Output type must be AC with zero-cross switching capability
• Mounting type must be chassis mount
• Package must be hockey puck form factor
• Termination must be screw terminal

The substitute part 84138120N (Crouzet GN+ series) meets these core requirements with the exception of output voltage range, which is rated 24-500V AC. This represents a reduced maximum voltage capability (500V vs. 660V) and a reduced minimum voltage (24V vs. 48V). The part maintains identical circuit configuration, load current, input voltage range, output type, mounting, package, and termination specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the H12WD4850GH and 84138120N are active products with RoHS compliance and MSL Level 1 ratings, indicating equivalent environmental and regulatory standing. Selection between these parts must be based on application voltage requirements. The H12WD4850GH supports output voltages up to 660V AC and minimum 48V AC, while the 84138120N supports up to 500V AC and minimum 24V AC. For applications operating within the 24-500V AC range, both parts are functionally equivalent. For applications requiring operation above 500V AC or below 48V AC, the H12WD4850GH is the appropriate selection. Both parts maintain identical control voltage input (4-32VDC), load current capacity (50A), switching characteristics (zero-cross AC), and mechanical form factor (hockey puck chassis mount with screw terminals).

Frequently Asked Questions (FAQ)

Q: Can the 84138120N replace the H12WD4850GH in all applications?

A: No. The 84138120N has a reduced output voltage range (24-500V AC vs. 48-660V AC). It is suitable only for applications operating within 24-500V AC. Applications requiring voltages above 500V AC or below 48V AC require the H12WD4850GH.

Q: Are the input control voltage requirements identical?

A: Yes. Both relays operate with 4-32VDC input control voltage and are directly compatible in control circuit design.

Q: Do both parts have the same load current rating?

A: Yes. Both the H12WD4850GH and 84138120N are rated for 50A load current and feature identical SPST-NO (1 Form A) circuit configuration.

Q: Are the mechanical packages interchangeable?

A: Yes. Both parts use hockey puck form factor with chassis mount configuration and screw terminal termination, allowing direct mechanical substitution where voltage requirements permit.

Q: What is the significance of zero-cross switching in both parts?

A: Zero-cross switching ensures the relay switches at the AC voltage zero-crossing point, reducing electromagnetic interference and extending load life by minimizing inrush current stress.

Q: Are both parts RoHS compliant?

A: Yes. Both the H12WD4850GH and 84138120N are RoHS compliant with MSL Level 1 (unlimited) moisture sensitivity ratings.

Q: What determines whether a substitute part is acceptable?

A: Substitution is acceptable when the substitute part maintains identical circuit configuration (SPST-NO), load current (50A), input voltage range (4-32VDC), output type (AC zero-cross), mounting type (chassis mount), package (hockey puck), and termination (screw terminal). Output voltage range must be compatible with application requirements.