CMD4850 Solid State Relay SPST-NO 50A Equivalent & Substitute Parts

Part Overview

The CMD4850 is a solid state relay (SSR) with SPST-NO (1 Form A) configuration, rated for 50A load current and 48–530V AC output voltage. This component features a hockey puck form factor with screw terminal connections and is designed for chassis mount applications. The CMD4850 is classified as "Not For New Designs," making identification of active equivalent parts essential for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across input voltage, load voltage, load current, and circuit configuration while meeting current compliance standards.

Substiute Parts

CMD4850

Sensata-CrydomIn Stock: 1056CMD4850 Datasheet

Current PartRFQ

84137120

Sensata-CrydomIn Stock: 92684137120 Datasheet

MFR RecommendedRFQ

CWD4850

Sensata-CrydomIn Stock: 2459CWD4850 Datasheet

MFR RecommendedRFQ

HD4850

Sensata-CrydomIn Stock: 942HD4850 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A)
• Load Current: Must be rated for 50A
• Output Type: Must be AC with Zero Cross capability
• Mounting Type: Must be Chassis Mount
• Termination Style: Must be Screw Terminal
• Package / Case: Must be Hockey Puck form factor
• Input Voltage Range: Must accommodate 4–32VDC or lower minimum
• Load Voltage Range: Must support the required operating voltage window

All three substitute parts (84137120, CWD4850, and HD4850) meet these core electrical and mechanical requirements. The primary differentiators are product status (Active vs. Not For New Designs), load voltage maximum rating, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

84137120 (GN Series): This part is the manufacturer-recommended substitute. It is Active status and ROHS3 compliant with REACH affected designation. The load voltage maximum extends to 660V, providing broader voltage compatibility than the CMD4850. Input voltage range remains 4–32VDC. This part is suitable for applications requiring extended load voltage headroom.

CWD4850 (CW48 Series): This part is Active status and ROHS3 compliant with REACH affected designation. It also supports 48–660V load voltage range. Inventory availability is highest among all substitutes at 2400 pieces. This part is suitable for applications where extended load voltage capability and component availability are priorities.

HD4850 (HD48 Series): This part is Active status and ROHS3 compliant with REACH affected designation. It maintains the same 48–530V load voltage range as the CMD4850 and offers a lower input voltage minimum of 3VDC (versus 4VDC). This part provides the closest electrical match to the original CMD4850 while offering Active product status and current compliance certifications.

All three substitutes are electrically compatible with the CMD4850 within their specified operating ranges. Selection should be based on application-specific load voltage requirements and compliance documentation needs.

Frequently Asked Questions (FAQ)

Q: Can the 84137120 or CWD4850 be used in applications designed for the CMD4850?

A: Yes. Both parts maintain identical input voltage range (4–32VDC), load current (50A), circuit configuration (SPST-NO), and output type (AC, Zero Cross). The extended load voltage maximum (660V vs. 530V) does not create incompatibility; it provides additional voltage margin. Mechanical compatibility (hockey puck form factor, screw terminals, chassis mount) is identical.

Q: What is the advantage of the HD4850 over the 84137120 and CWD4850?

A: The HD4850 maintains the same load voltage range (48–530V) as the original CMD4850, making it the most direct electrical equivalent. It also offers a lower input voltage minimum (3VDC), providing broader input compatibility. All three parts are Active status with current compliance certifications.

Q: Are there compliance differences between the substitutes?

A: All three substitutes are ROHS3 compliant and REACH affected. The CMD4850 is RoHS compliant (earlier standard). The substitutes represent current compliance posture. ECCN and HTSUS classifications are consistent across all parts.

Q: Does the hockey puck form factor remain consistent across all substitutes?

A: Yes. All substitute parts maintain the hockey puck package / case form factor with screw terminal connections and chassis mount configuration. Physical and electrical interface compatibility is preserved.

Q: Which substitute should be selected for new production?

A: The 84137120, CWD4850, and HD4850 are all Active status parts suitable for new production. Selection depends on load voltage requirements: use 84137120 or CWD4850 for applications requiring voltage headroom up to 660V; use HD4850 for applications matching the original 48–530V specification.