Sensata-Crydom A4812 SSR Relay Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom A4812 is a solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 12A load current at 80–530V AC output. This component features a hockey puck form factor with screw terminal connections and zero-cross switching capability. The A4812 is classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing system support and new design implementations.

Substiute Parts

A4812

Sensata-CrydomIn Stock: 864A4812 Datasheet

Current PartRFQ

A4825

Sensata-CrydomIn Stock: 869A4825 Datasheet

DirectRFQ

84134111

Sensata-CrydomIn Stock: 116284134111 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A4812 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A)
• Output Type: Must be AC with zero-cross switching
• Input Voltage: Must support 90–280VAC
• Load Voltage Range: Must encompass or exceed 80–530V
• Mounting Type: Must be chassis mount
• Package / Case: Must be hockey puck form factor
• Termination Style: Must be screw terminal

Two substitute parts meet these criteria:

1. A4825 (Direct Manufacturer Substitute): Active product from the same A48 series with identical electrical specifications except for increased load current rating (25A vs. 12A). Maintains all mechanical and electrical interface requirements.

2. 84134111 (Manufacturer-Recommended Substitute): Active product from the GN series with expanded load voltage range (48–660V vs. 80–530V) and increased load current rating (25A). Meets all interface and configuration requirements with enhanced voltage capability.

Parameter Comparison

Engineering Selection Recommendations

A4825 Selection Criteria: Choose the A4825 for direct replacement in applications where the original 12A load current specification is adequate. The A4825 maintains identical electrical and mechanical interfaces while offering active product status and ROHS3 compliance. This option is suitable for legacy system maintenance where load current does not exceed 12A.

84134111 Selection Criteria: Choose the 84134111 for applications requiring enhanced voltage margin or where future load current expansion to 25A is anticipated. The extended load voltage range (48–660V vs. 80–530V) provides additional design flexibility. This part is the manufacturer-recommended option and is suitable for new designs or system upgrades requiring higher current capacity.

Both substitute parts are active products with current manufacturing support and regulatory compliance certifications, eliminating obsolescence risk associated with the A4812.

Frequently Asked Questions (FAQ)

Q: Can the A4825 be used as a direct drop-in replacement for the A4812?

A: Yes. The A4825 maintains identical circuit configuration, input/output voltage specifications, mounting type, package form factor, and termination style. The increased load current rating (25A vs. 12A) does not prevent substitution in applications operating at or below 12A.

Q: What is the primary difference between the A4825 and 84134111 substitutes?

A: Both parts support 25A load current. The 84134111 provides an extended load voltage range of 48–660V compared to the A4825's 80–530V range. The 84134111 is from the GN series while the A4825 remains in the A48 series.

Q: Are there any compliance differences between the substitute parts?

A: Both A4825 and 84134111 are ROHS3 compliant and REACH affected. The original A4812 is REACH unaffected. Systems subject to REACH regulations should confirm compatibility with the substitute parts' regulatory status.

Q: Does the hockey puck package form factor remain consistent across all three parts?

A: Yes. All three parts—A4812, A4825, and 84134111—use the hockey puck package with screw terminal connections, ensuring mechanical compatibility with existing mounting and wiring infrastructure.

Q: Which substitute part should be selected for new designs?

A: The 84134111 is the manufacturer-recommended option for new designs. It offers active product status, enhanced voltage capability, and higher current capacity, providing greater design margin and future-proofing.