Sensata-Crydom A4850 SSR Relay SPST-NO 50A Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom A4850 is an active solid-state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 50A load current and 80V to 530V output voltage range. This chassis-mount hockey puck relay operates with AC zero-cross switching and accepts 90–280VAC input. The part is ROHS3 compliant and REACH affected. Equivalent and substitute parts are identified when inventory constraints, regional availability, or specific compliance requirements necessitate alternative sourcing while maintaining functional compatibility.

Substiute Parts

A4850

Sensata-CrydomIn Stock: 920A4850 Datasheet

Current PartRFQ

84134121

Sensata-CrydomIn Stock: 72184134121 Datasheet

DirectRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters across all candidate parts:

• Circuit configuration: SPST-NO (1 Form A)
• Output type: AC, Zero Cross
• Load current rating: 50A
• Mounting type: Chassis Mount
• Package type: Hockey Puck
• Termination style: Screw Terminal

The A4850 specifies a load voltage range of 80V–530V. Substitute parts must support this range or a range that fully encompasses it. Input voltage tolerance and compliance certifications are secondary selection criteria that may influence substitution decisions based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts satisfy the core functional requirements of the A4850. The Sensata-Crydom 84134121 maintains identical input voltage tolerance (90–280VAC) and ROHS3 compliance, with an expanded load voltage range (48V–660V) that encompasses the A4850 specification. The Crouzet 84137121N offers a slightly reduced input voltage floor (20VAC minimum) and RoHS compliance status, with the same expanded load voltage range.

Selection between these substitutes depends on compliance requirements specific to the application. ROHS3 compliance is maintained with the Sensata-Crydom 84134121. The Crouzet 84137121N is RoHS compliant but REACH unaffected, whereas both Sensata-Crydom parts are REACH affected. All three parts are active products with current manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can the 84134121 directly replace the A4850? A: Yes. Both parts share identical circuit configuration, output type, load current rating, mounting type, package type, and termination style. The 84134121 has an expanded load voltage range (48V–660V) that fully encompasses the A4850 range (80V–530V), and maintains the same input voltage specification (90–280VAC) and ROHS3 compliance.

Q: What is the difference between the 84134121 and 84137121N? A: Both parts have identical load voltage ranges (48V–660V) and load current ratings (50A). The 84134121 is manufactured by Sensata-Crydom with ROHS3 compliance and REACH affected status. The 84137121N is manufactured by Crouzet with RoHS compliance and REACH unaffected status. The 84137121N has a lower input voltage minimum (20VAC versus 90VAC).

Q: Are all three parts in the same physical package? A: Yes. All three parts use the hockey puck package with screw terminal termination and chassis mount configuration.

Q: Which substitute should be selected for ROHS3 compliance? A: The Sensata-Crydom 84134121 maintains ROHS3 compliance. The Crouzet 84137121N is RoHS compliant but not specifically ROHS3 certified.

Q: Do the substitute parts support the full load voltage range of the A4850? A: Yes. Both substitute parts support 48V–660V, which exceeds the A4850 range of 80V–530V.