HD4812T Solid State Relay - Equivalent & Substitute Parts

Part Overview

The HD4812T is an active Solid State Relay (SSR) manufactured by Sensata-Crydom, designed for SPST-NO (1 Form A) switching applications. This hockey puck-style relay operates with AC zero-cross output capability and is rated for 12A load current across a 48V to 530V operating range. The device accepts 4-32VDC input control signals and features screw terminal connections for chassis-mount installations. RoHS compliance and MSL Level 1 rating ensure suitability for standard industrial and commercial applications. Equivalent substitute parts are identified based on matching circuit topology, termination style, package form factor, and input voltage compatibility.

Substiute Parts

HD4812T

Sensata-CrydomIn Stock: 917HD4812T Datasheet

Current PartRFQ

84137000N

CrouzetIn Stock: 89184137000N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HD4812T is determined by the following critical parameters:

• Circuit Topology: SPST-NO (1 Form A) configuration required for direct functional equivalence
• Input Voltage Compatibility: Control signal range must accommodate 4-32VDC input specification
• Output Type: AC zero-cross switching capability for synchronized load control
• Termination Interface: Screw terminal connections for mechanical and electrical compatibility
• Package Form Factor: Hockey puck chassis-mount design for physical interchangeability
• Compliance Standards: RoHS compliance and MSL Level 1 rating for regulatory alignment

The substitute part 84137000N (Crouzet GN series) meets these core substitution criteria. However, the load current rating (10A vs. 12A) and maximum load voltage (280V vs. 530V) represent functional limitations that must be evaluated within specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the HD4812T and 84137000N are active products with RoHS compliance and MSL Level 1 ratings, ensuring regulatory alignment for industrial applications. The HD4812T provides extended load voltage capability (48-530V) and higher current capacity (12A), making it suitable for high-voltage and high-power switching scenarios. The 84137000N operates within a reduced load voltage window (24-280V) and lower current specification (10A), positioning it for moderate-power applications within its rated parameters. Selection between these parts must be based on specific load voltage and current requirements of the target application. Both devices share identical input voltage compatibility (4-32VDC), circuit topology (SPST-NO), output switching type (AC zero-cross), and physical form factor (hockey puck chassis mount with screw terminals), ensuring mechanical and electrical interchangeability within their respective electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the 84137000N directly replace the HD4812T in all applications?

A: Direct replacement is limited by electrical ratings. The 84137000N is suitable only for applications where load voltage does not exceed 280V and load current does not exceed 10A. Applications requiring the full 48-530V range or 12A capacity require the HD4812T.

Q: What determines compatibility between these SSR models?

A: Compatibility is established through matching SPST-NO circuit configuration, AC zero-cross output type, 4-32VDC input voltage range, screw terminal termination, and hockey puck chassis-mount package. Electrical ratings (voltage and current) must be verified separately for each application.

Q: Are both parts physically interchangeable?

A: Yes. Both devices use identical hockey puck form factor, chassis-mount design, and screw terminal connections, allowing physical installation in the same mounting location. Electrical compatibility must be confirmed based on application load specifications.

Q: What is the significance of the zero-cross output type?

A: AC zero-cross switching synchronizes relay activation with the AC waveform zero-crossing point, reducing electromagnetic interference and switching stress on connected loads. Both parts provide this capability.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the HD4812T and 84137000N are RoHS compliant with MSL Level 1 (unlimited moisture sensitivity) ratings, meeting standard industrial regulatory requirements.

Q: How should load voltage and current requirements influence part selection?

A: Verify that the selected part's maximum load voltage and current ratings meet or exceed the application requirements. The HD4812T accommodates higher voltage (530V maximum) and current (12A) specifications, while the 84137000N is rated for 280V maximum and 10A maximum.