PSD4850 Equivalent & Substitute Parts

Part Overview

The PSD4850 is a solid-state relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (1 Form A) device in a hockey puck package. This component is rated for 50A load current with AC output and zero-cross switching capability, operating across a 48V to 530V load voltage range with 4V to 32VDC input control voltage. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and redesign applications where this relay is specified.

Substiute Parts

PSD4850

Sensata-CrydomIn Stock: 939PSD4850 Datasheet

Current PartRFQ

RA4850-D12

Carlo Gavazzi Inc.In Stock: 942RA4850-D12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PSD4850 is determined by strict alignment of the following electrical and mechanical parameters:

• Circuit configuration: SPST-NO (1 Form A) topology
• Load current rating: 50 A minimum
• Load voltage range: Must encompass or exceed 48V to 530V specification
• Input control voltage: Must accommodate 4V to 32VDC range
• Output switching type: AC with zero-cross capability
• Package form factor: Hockey puck chassis mount configuration
• Termination interface: Screw terminal connection

The RA4850-D12 manufactured by Carlo Gavazzi Inc. meets these substitution criteria with compatible electrical ratings and identical mechanical packaging.

Parameter Comparison

Engineering Selection Recommendations

The RA4850-D12 is a direct functional substitute for the PSD4850. Both devices share identical circuit topology, load current capacity, output switching characteristics, and mechanical packaging. The RA4850-D12 offers an extended input voltage range (3V minimum versus 4V minimum) and a lower load voltage floor (42V versus 48V), providing broader operational compatibility. The RA4850-D12 maintains active product status with current manufacturing support, whereas the PSD4850 is obsolete. Both components are RoHS compliant, satisfying regulatory requirements for equivalent applications.

Frequently Asked Questions (FAQ)

Q: Can the RA4850-D12 directly replace the PSD4850 in existing installations?

A: Yes. Both relays share identical SPST-NO circuit configuration, 50A load current rating, AC zero-cross output type, hockey puck package form factor, and screw terminal termination. The RA4850-D12 input voltage range (3–32VDC) encompasses the PSD4850 specification (4–32VDC), and the load voltage range (42–530V) covers the PSD4850 requirement (48–530V).

Q: What are the key differences between these two relays?

A: The primary differences are manufacturer (Sensata-Crydom versus Carlo Gavazzi Inc.), product status (obsolete versus active), and minor parameter extensions in the RA4850-D12. The RA4850-D12 accepts input voltages as low as 3VDC and load voltages as low as 42V, whereas the PSD4850 specifies 4VDC minimum input and 48V minimum load voltage.

Q: Are both relays RoHS compliant?

A: Yes. Both the PSD4850 and RA4850-D12 are RoHS compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: Does the hockey puck package form factor remain identical?

A: Yes. Both relays use the hockey puck chassis mount package with screw terminal connections, ensuring mechanical and electrical interface compatibility.

Q: Why is the PSD4850 listed as obsolete?

A: The PSD4850 has been discontinued by Sensata-Crydom. The RA4850-D12 represents an active alternative from Carlo Gavazzi Inc. with equivalent electrical and mechanical specifications.