10SST120 Solid State Relay - Equivalent & Substitute Parts

Part Overview

The 10SST120 is a Solid State SPST-NO (1 Form A) relay manufactured by Sensata-Crydom, designed for AC load switching applications. This component features a hockey puck form factor with quick connect termination, rated for 10A at 90-140V AC loads with 4.6-10VDC input control. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications.

Substiute Parts

10SST120

Sensata-CrydomIn Stock: 102010SST120 Datasheet

Current PartRFQ

MCST1225CS

Sensata-CrydomIn Stock: 763MCST1225CS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 10SST120 is determined by the following critical parameters:

• Circuit Configuration: Must maintain SPST-NO (1 Form A) topology for direct functional replacement
• Output Type: AC output capability required for load switching compatibility
• Load Voltage Range: 90-140V AC compatibility is mandatory
• Package Form Factor: Hockey puck chassis mount configuration ensures mechanical fit
• Input Control Voltage: 4.6-10VDC input range defines control signal compatibility
• Load Current Rating: Minimum 10A capacity required; higher ratings provide design margin

The MCST1225CS qualifies as a substitute based on matching load voltage range (90-140V AC), identical circuit configuration (SPST-NO), compatible package form factor (hockey puck), and compatible input voltage range (0-10VDC encompasses the original 4.6-10VDC specification). The higher current rating (25A vs. 10A) provides additional capacity margin for the same application envelope.

Parameter Comparison

Engineering Selection Recommendations

The MCST1225CS is an active product from the same manufacturer (Sensata-Crydom) and represents a direct functional substitute for the obsolete 10SST120. Both components share identical load voltage specifications (90-140V AC), circuit topology (SPST-NO), and package form factor (hockey puck chassis mount).

The MCST1225CS provides enhanced specifications: input voltage range of 0-10VDC (broader than the original 4.6-10VDC), increased load current capacity (25A vs. 10A), and proportional control capability. The active product status ensures ongoing availability and technical support.

Termination style differs between the two components: the original uses quick connect terminals while the substitute employs screw terminals. This difference requires mechanical interface verification during integration.

RoHS compliance status is confirmed for the MCST1225CS, supporting environmental and regulatory requirements for new designs and system updates.

Frequently Asked Questions (FAQ)

Q: Can the MCST1225CS directly replace the 10SST120 without circuit modifications?

A: Functional replacement is supported based on matching SPST-NO circuit configuration, identical load voltage range (90-140V AC), and compatible input control voltage. Termination style differs (quick connect vs. screw terminal), requiring mechanical interface adaptation.

Q: What is the significance of the higher 25A current rating on the MCST1225CS?

A: The MCST1225CS 25A rating exceeds the original 10A specification, providing design margin for the same application. Applications requiring exactly 10A operation remain fully compatible; the higher rating does not degrade performance at lower currents.

Q: Does the broader input voltage range (0-10VDC) of the MCST1225CS affect compatibility?

A: The original 4.6-10VDC input range is fully contained within the MCST1225CS 0-10VDC specification. Existing control circuits designed for the 10SST120 operate within the substitute's input range without modification.

Q: What is the impact of proportional control capability on the MCST1225CS?

A: Proportional control is an additional feature of the MCST1225CS not present in the original 10SST120. Applications using standard on-off switching operate identically; proportional control capability remains unused unless specifically implemented in the control circuit.

Q: Are there compliance or certification differences between these components?

A: The MCST1225CS carries RoHS compliance certification and active product status. The 10SST120, being obsolete, no longer receives manufacturer support. Both components share identical ECCN (EAR99) and HTSUS (8536.49.0080) classifications.