CMRA4845 Equivalent & Substitute Parts

Part Overview

The CMRA4845 is a Solid State Relay (SSR) manufactured by Sensata-Crydom, configured as a SPST-NO (1 Form A) relay with integrated heat sink for DIN rail mounting. This component operates with AC zero-cross output capability, handling 45A load current across a voltage range of 48V to 530V. The part is currently in Active product status with 898 units available in inventory.

Substitute parts become necessary when the CMRA4845 reaches end-of-life status, when inventory becomes depleted, or when application requirements align with alternative configurations within the same electrical and mechanical parameter space. The GNR45BHZ represents a direct functional alternative, though it carries Obsolete product status and operates at an extended maximum voltage rating of 600V.

Substiute Parts

CMRA4845

Sensata-CrydomIn Stock: 998CMRA4845 Datasheet

Current PartRFQ

GNR45BHZ

Sensata-CrydomIn Stock: 877GNR45BHZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMRA4845 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A)
• Output Type: Must be AC with Zero Cross capability
• Input Voltage: Must accept 90 ~ 140VAC
• Load Current Rating: Must support 45A minimum
• Load Voltage Range: Must encompass or exceed 48V ~ 530V operating window
• Mounting Type: Must support DIN Rail installation
• Termination Style: Must use Screw Terminal connection
• Environmental Compliance: Must meet RoHS and REACH requirements

The GNR45BHZ qualifies as a direct substitute based on matching all critical electrical parameters (SPST-NO circuit, AC zero-cross output, 90 ~ 140VAC input, 45A load current, screw terminal termination, and DIN rail mounting). The GNR45BHZ extends the maximum load voltage rating to 600V, providing additional operational headroom within the same form factor and electrical interface.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: The CMRA4845 is the recommended choice for new designs and applications. This part maintains Active product status, ensuring long-term availability and manufacturer support. ROHS3 compliance provides the highest environmental standard certification.

Substitute Selection: The GNR45BHZ serves as a functional equivalent for existing installations or legacy system maintenance. While this part carries Obsolete status, it remains electrically and mechanically compatible with CMRA4845 applications. The extended load voltage rating (600V maximum versus 530V) provides additional operational margin. Selection of GNR45BHZ should be limited to replacement scenarios where inventory of the primary part is unavailable. RoHS compliance (non-ROHS3) remains acceptable for applications not requiring the highest environmental standard.

Both parts share identical input voltage specifications, load current ratings, circuit configuration, and mounting requirements, ensuring direct interchangeability within the specified electrical operating window.

Frequently Asked Questions (FAQ)

Q: Can the GNR45BHZ directly replace the CMRA4845 in existing installations?

A: Yes. Both parts share identical SPST-NO circuit configuration, AC zero-cross output, 90 ~ 140VAC input voltage, 45A load current rating, DIN rail mounting, and screw terminal termination. The GNR45BHZ operates within the CMRA4845 load voltage window (48V ~ 530V) and extends to 600V maximum, providing full compatibility.

Q: What is the difference between the CMRA4845 and GNR45BHZ package types?

A: The CMRA4845 features an integrated heat sink within the SSR package. The GNR45BHZ is configured as a module. Both mount on DIN rail and use screw terminal connections. Package type selection depends on thermal management requirements and available mounting space in the target application.

Q: Why is the GNR45BHZ listed as Obsolete?

A: Obsolete product status indicates the manufacturer has discontinued active production and support. The GNR45BHZ remains functionally equivalent and electrically compatible but should be considered for replacement applications only. The CMRA4845 is the recommended long-term solution for new designs.

Q: Are there compliance differences between CMRA4845 and GNR45BHZ?

A: The CMRA4845 meets ROHS3 compliance, representing the highest environmental standard. The GNR45BHZ meets RoHS compliance. Both parts are REACH Affected and carry EAR99 ECCN classification. Compliance selection depends on application regulatory requirements.

Q: What load voltage range should I use for substitution decisions?

A: The CMRA4845 operates from 48V to 530V. The GNR45BHZ extends this range to 600V maximum. For applications operating within 48V ~ 530V, both parts are fully interchangeable. Applications requiring operation above 530V require the GNR45BHZ.