A4840-10 Solid State Relay SPST-NO 40A 80-530V

Part Overview

The A4840-10 is an active Solid State Relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (1 Form A) device in a Hockey Puck package. This component functions as an electronic switch for AC load control, accepting control input voltage between 90-280VAC and supporting load voltages from 80V to 530V at 40A capacity. The part is RoHS Compliant and currently in active production status with 1002 units available in inventory. Equivalent and substitute parts are identified when they maintain functional compatibility across critical electrical parameters while meeting the same regulatory and packaging requirements.

Substiute Parts

A4840-10

Sensata-CrydomIn Stock: 1047A4840-10 Datasheet

Current PartRFQ

84137321N

CrouzetIn Stock: 91084137321N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A4840-10 are identified based on functional equivalence across the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Output Type: Must be AC to ensure compatibility with load requirements
• Package / Case: Must be Hockey Puck to satisfy mechanical and thermal mounting constraints
• Mounting Type: Must be Chassis Mount for installation compatibility
• Termination Style: Must be Screw Terminal for connection compatibility
• Input Voltage Range: Must overlap or encompass the 90-280VAC control signal specification
• Load Voltage Range: Must encompass or exceed the 80V-530V load voltage requirement
• Load Current Rating: Must meet or exceed the 40A requirement
• RoHS Compliance: Must maintain RoHS Compliant status for regulatory alignment

The substitute part 84137321N (Crouzet GN series) satisfies all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the A4840-10 and 84137321N are active production components with RoHS Compliance certification, ensuring regulatory alignment for current and future applications. The 84137321N substitute provides enhanced current capacity (50A vs. 40A) and extended load voltage range (48V-660V vs. 80V-530V), offering design margin for applications operating within the A4840-10 specification envelope. The input voltage range of the substitute (90-260VAC) is narrower than the primary part; applications requiring operation above 260VAC input must use the A4840-10. Both components maintain identical circuit topology, package form factor, and termination methodology, ensuring direct mechanical and electrical interchangeability within the specified parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can the 84137321N substitute for the A4840-10 in all applications?

A: The 84137321N is functionally equivalent for applications where the control input voltage does not exceed 260VAC. If your application requires input voltage operation between 260VAC and 280VAC, the A4840-10 must be used. For all other parameter ranges (load voltage, current, circuit configuration), the substitute is compatible.

Q: What is the significance of the Hockey Puck package form factor?

A: The Hockey Puck package is a standardized thermal and mechanical form factor for high-current SSR devices. Both parts use this package, ensuring identical mounting footprint, thermal dissipation characteristics, and mechanical fit within chassis-mount installations.

Q: Does the higher current rating of the 84137321N (50A vs. 40A) affect circuit design?

A: No. A component with higher current capacity can be used in applications rated for lower current without performance degradation. The 50A rating of the substitute provides additional design margin and thermal headroom compared to the 40A primary part.

Q: Are there any compliance differences between these parts?

A: Both parts are RoHS Compliant and carry the same ECCN (EAR99) and HTSUS (8536.49.0080) classifications. The 84137321N carries REACH Unaffected status, indicating no additional regulatory burden for European applications.

Q: What is the load voltage range significance?

A: The load voltage range defines the AC voltage that the relay can switch. The A4840-10 operates from 80V to 530V, while the 84137321N operates from 48V to 660V. The substitute's extended range (particularly the lower 48V minimum) provides compatibility with a broader range of load voltage specifications.