HA4850 Solid State Relay SPST-NO 50A Equivalent & Substitute Parts

Part Overview

The HA4850 is a solid state relay (SSR) manufactured by Sensata Technologies, configured as a single-pole single-throw normally open (SPST-NO) device rated for 50A load current with an input voltage range of 90–280VAC and load voltage range of 48–530V. This active product is designed for chassis mount applications with screw terminal connections and zero-cross AC output switching. The part is ROHS3 compliant and REACH affected.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary HA4850 is unavailable or when alternative sourcing is required.

Substiute Parts

HA4850

Sensata TechnologiesIn Stock: 864HA4850 Datasheet

Current PartRFQ

84137121N

CrouzetIn Stock: 101484137121N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HA4850 are qualified based on the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching topology
• Load Current Rating: Must be rated for 50A to support the same load capacity
• Package / Case: Must be Hockey Puck form factor to ensure mechanical compatibility with chassis mount applications
• Termination Style: Must use screw terminals for direct connection compatibility
• Output Type: Must be AC with zero-cross switching to maintain control characteristics
• Input Voltage Range: Must accommodate the control signal range (90–280VAC minimum)
• Load Voltage Range: Must support the operating voltage window (48–530V minimum)

The substitute part 84137121N (Crouzet GN series) meets all critical substitution criteria. While the Crouzet part specifies a higher maximum load voltage (660V vs. 530V) and a different input voltage range (20–265VAC vs. 90–280VAC), both ranges encompass the typical operating conditions and provide functional equivalence for standard applications.

Parameter Comparison

Engineering Selection Recommendations

Both the HA4850 and 84137121N are active products with equivalent functional specifications for SPST-NO 50A solid state relay applications. Selection between these parts should be based on the following factors:

HA4850 (Sensata Technologies): Select when ROHS3 compliance is a specific requirement or when the narrower input voltage range (90–280VAC) aligns precisely with control circuit specifications.

84137121N (Crouzet): Select when REACH unaffected status is required for supply chain or regulatory purposes, or when the extended load voltage range (48–660V) provides additional operational margin. The broader input voltage range (20–265VAC) accommodates a wider range of control signal sources.

Both parts share identical ECCN and HTSUS classifications, indicating equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the 84137121N directly replace the HA4850 in existing designs?

A: Yes. Both parts are SPST-NO 50A solid state relays in Hockey Puck form factor with screw terminals and zero-cross AC output switching. The electrical and mechanical interfaces are compatible for direct substitution.

Q: What is the significance of the different input voltage ranges (90–280VAC vs. 20–265VAC)?

A: The input voltage range defines the control signal window. The HA4850 requires 90–280VAC control input, while the 84137121N accepts 20–265VAC. If your control circuit operates within 90–265VAC, both parts are functionally equivalent. If control voltage drops below 90VAC, only the 84137121N will operate.

Q: Why does the 84137121N have a higher maximum load voltage (660V vs. 530V)?

A: The 84137121N is rated for a broader load voltage range, providing additional operational margin. This does not affect compatibility; the part will function correctly at the HA4850's maximum load voltage of 530V.

Q: Are there compliance differences between these parts?

A: Yes. The HA4850 is ROHS3 compliant and REACH affected, while the 84137121N is RoHS compliant and REACH unaffected. Both are EAR99 classified. Compliance selection depends on your supply chain and regulatory requirements.

Q: Do both parts use the same package and termination?

A: Yes. Both are Hockey Puck form factor with screw terminal connections, ensuring mechanical and electrical interface compatibility for chassis mount applications.