CMD4875 Solid State Relay SPST-NO 75A 48-530V Equivalent & Substitute Parts

Part Overview

The CMD4875 is a solid state relay (SSR) manufactured by Sensata-Crydom, configured as a single-pole single-throw normally open (SPST-NO) device rated for 75A load current with a 48V to 530V output voltage range. This component features a hockey puck form factor with screw terminal connections and zero-cross AC output switching. The CMD4875 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

CMD4875

Sensata-CrydomIn Stock: 1167CMD4875 Datasheet

Current PartRFQ

84137130

Sensata TechnologiesIn Stock: 117684137130 Datasheet

MFR RecommendedRFQ

CWD4890

Sensata TechnologiesIn Stock: 1116CWD4890 Datasheet

MFR RecommendedRFQ

HD4875

Sensata-CrydomIn Stock: 822HD4875 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMD4875 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPST-NO (1 Form A)
• Output type: AC, Zero Cross
• Package / Case: Hockey Puck
• Termination style: Screw Terminal
• Mounting type: Chassis Mount

Electrical Compatibility Criteria:

• Input voltage range must encompass or match the 4 ~ 32VDC requirement
• Load voltage range must support the 48V minimum and accommodate the 530V maximum of the original part
• Load current rating must equal or exceed 75A

The substitute parts identified below meet these criteria with variations in load voltage maximum ratings and current capacity. Parts are grouped by their compatibility with the CMD4875's electrical specifications and form factor requirements.

Parameter Comparison

Engineering Selection Recommendations

HD4875 (Sensata-Crydom): This part is the primary direct replacement for the CMD4875. It maintains identical load voltage range (48V ~ 530V) and current rating (75A), with matching circuit configuration and package form factor. The HD4875 is active in production status and carries ROHS3 compliance with REACH affected designation, providing regulatory alignment for current manufacturing standards. The input voltage range extends to 3VDC minimum, providing enhanced low-voltage operation capability compared to the CMD4875's 4VDC minimum.

84137130 (Sensata Technologies): This part provides electrical compatibility with an extended load voltage maximum of 660V, accommodating applications requiring higher voltage tolerance. The 75A current rating matches the CMD4875 specification. This part is active in production and carries ROHS3 compliance with REACH affected designation. The extended voltage range makes this suitable for systems operating near the 530V upper limit of the original part.

CWD4890 (Sensata Technologies): This part offers increased current capacity at 90A, exceeding the CMD4875's 75A rating. The load voltage range extends to 660V maximum. This part is active in production and carries ROHS3 compliance with REACH affected designation. Selection of this part is appropriate for applications requiring higher current handling or voltage margin, though the increased current rating represents an over-specification for 75A load requirements.

Frequently Asked Questions (FAQ)

Q: Can the HD4875 be used as a direct replacement for the CMD4875?

A: Yes. The HD4875 maintains identical electrical specifications for load voltage range (48V ~ 530V) and current rating (75A), with matching circuit configuration (SPST-NO), output type (AC, Zero Cross), and package form factor (Hockey Puck). The HD4875 is active in production, addressing the obsolete status of the CMD4875.

Q: What is the difference between the 84137130 and the CMD4875?

A: The 84137130 provides an extended load voltage maximum of 660V compared to the CMD4875's 530V maximum. The 75A current rating and input voltage range (4 ~ 32VDC) remain equivalent. The 84137130 is suitable for applications requiring higher voltage tolerance within the same current specification.

Q: Why does the CWD4890 have a higher current rating than the CMD4875?

A: The CWD4890 is rated for 90A load current, compared to the CMD4875's 75A. This represents a higher current capacity device within the same package form factor and voltage range (48V ~ 660V). Selection of the CWD4890 is appropriate only when the application requires current handling above 75A.

Q: Are all substitute parts compatible with the same mounting and termination requirements?

A: Yes. All substitute parts (HD4875, 84137130, and CWD4890) share identical mounting type (Chassis Mount), package form factor (Hockey Puck), and termination style (Screw Terminal) with the CMD4875, ensuring mechanical and electrical interface compatibility.

Q: What regulatory compliance differences exist between the CMD4875 and its substitutes?

A: The CMD4875 carries RoHS Compliant status. All substitute parts (HD4875, 84137130, and CWD4890) carry ROHS3 Compliant status with REACH Affected designation, reflecting current regulatory requirements for electronic components in manufacturing and distribution.

Q: Can the input voltage range difference between HD4875 and CMD4875 affect system operation?

A: The HD4875 input voltage range (3 ~ 32VDC) extends to a lower minimum than the CMD4875 (4 ~ 32VDC). This difference does not create incompatibility; the HD4875 operates across a broader input voltage window, providing enhanced flexibility for systems operating near the 4VDC threshold.