A4840 Solid State Relay SPST-NO 40A 80-530V

Part Overview

The A4840 is an active Sensata-Crydom solid state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 40A load current and 80-530V output voltage range. This chassis-mount relay features screw terminal connections and zero-cross AC output switching. The part is ROHS3 compliant and currently in active production with 958 units in stock.

Equivalent and substitute parts are identified when design requirements allow for higher current ratings, extended voltage ranges, or alternative manufacturer sourcing while maintaining the same circuit topology and termination style.

Substiute Parts

A4840

Sensata-CrydomIn Stock: 1020A4840 Datasheet

Current PartRFQ

84134121

Sensata-CrydomIn Stock: 72184134121 Datasheet

MFR RecommendedRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A4840 is determined by the following critical parameters:

• Circuit topology: SPST-NO (1 Form A) configuration required
• Output switching: AC with zero-cross capability required
• Termination: Screw terminal connection required
• Package form factor: Hockey Puck chassis mount required
• Load current rating: Equal to or greater than 40A
• Input voltage: 90-280VAC compatible range
• Load voltage: Must encompass or exceed 80-530V range

The identified substitutes (84134121 and 84137121N) meet these criteria with higher current ratings (50A) and extended load voltage ranges (48-660V), providing design flexibility for applications requiring increased capacity within the same physical and electrical interface constraints.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and regulatory compliance suitable for industrial applications.

84134121 (Sensata-Crydom GN series) provides a direct manufacturer upgrade path with identical input voltage range (90-280VAC), increased load current capacity (50A vs 40A), and extended load voltage range (48-660V vs 80-530V). ROHS3 compliance is maintained. This part is recommended for applications requiring higher current capacity within the same supply voltage specifications.

84137121N (Crouzet GN series) offers equivalent electrical performance with 50A current rating and 48-660V load voltage range. Input voltage range is slightly narrower (20-265VAC vs 90-280VAC). RoHS compliance is confirmed. This part is suitable for applications where Crouzet sourcing is preferred and input voltage requirements fall within the 20-265VAC specification.

Frequently Asked Questions (FAQ)

Q: Can the A4840 be directly replaced with 84134121?

A: Yes. Both parts share identical circuit topology (SPST-NO), output switching type (AC zero-cross), termination style (screw terminal), and package form factor (hockey puck chassis mount). The 84134121 provides higher current capacity (50A vs 40A) and extended load voltage range (48-660V vs 80-530V) while maintaining the same input voltage specification (90-280VAC).

Q: What is the key difference between 84134121 and 84137121N?

A: Both parts have identical load current (50A) and load voltage range (48-660V). The primary difference is manufacturer (Sensata-Crydom vs Crouzet) and input voltage range (90-280VAC vs 20-265VAC). Select based on supply voltage requirements and preferred manufacturer sourcing.

Q: Are all three parts compatible with the same mounting and termination infrastructure?

A: Yes. All three parts are chassis-mount relays with screw terminal connections in hockey puck package form factor, ensuring mechanical and electrical interface compatibility.

Q: What compliance certifications apply to these parts?

A: A4840 and 84134121 are ROHS3 compliant. 84137121N is RoHS compliant. All three parts carry EAR99 ECCN classification. Verify specific compliance requirements for your application before selection.

Q: Can 84137121N be used in applications designed for the A4840?

A: Compatibility depends on input voltage requirements. The 84137121N input range (20-265VAC) does not fully encompass the A4840 specification (90-280VAC). Verify that your supply voltage falls within 20-265VAC before substitution. Load voltage and current requirements are fully compatible.