CKRA4820 Solid State Relay SPST-NO 20A 48-530V Equivalent & Substitute Parts

Part Overview

The CKRA4820 is a Solid State SPST-NO (1 Form A) relay manufactured by Sensata-Crydom, designed for AC load switching applications with integrated heat sink and DIN Rail mounting. This component operates with input voltage of 90-280VAC and supports load voltages from 48V to 530V at 20A capacity with zero-cross switching. The CKRA4820 is designated as Last Time Buy, indicating production discontinuation. Equivalent and substitute parts are necessary to maintain system functionality and ensure continued availability for new designs and field replacements.

Key Parameters

Parameter	CKRA4820
Manufacturer	Sensata-Crydom
Series	CKR48
Circuit Configuration	SPST-NO (1 Form A)
Output Type	AC, Zero Cross
Input Voltage	90-280VAC
Load Voltage Range	48V-530V
Load Current	20A
Mounting Type	DIN Rail
Termination Style	Screw Terminal
Package Type	SSR with Integrated Heat Sink
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CKRA4820 is determined by the following critical parameters: SPST-NO circuit configuration, 20A load current capacity, AC zero-cross output type, DIN Rail mounting capability, and screw terminal termination. The load voltage range and input voltage specifications define the operational envelope within which substitutes must function.

Substitute parts are grouped into two categories based on load voltage compatibility:

Category 1 - Extended Load Voltage Range (48V-600V or higher): Parts that support the full or extended load voltage specification of the CKRA4820.

Category 2 - Reduced Load Voltage Range (24V-530V): Parts with lower minimum load voltage that still accommodate the primary operating range of the CKRA4820.

All substitute parts maintain the 20A load current, SPST-NO configuration, AC zero-cross switching, and DIN Rail mounting requirements.

Parameter Comparison

Parameter	CKRA4820	DR2260A20U	ASR-SV480A20ZY-L	GNR20ACZH
Manufacturer	Sensata-Crydom	Sensata-Crydom	Altran Magnetics, LLC	Crouzet
Series	CKR48	DR22	SV	GNR
Circuit Configuration	SPST-NO (1 Form A)	SPST-NO (1 Form A)	SPST-NO (1 Form A)	SPST-NO (1 Form A)
Output Type	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross	AC, Zero Cross
Input Voltage	90-280VAC	90-280VAC/DC	90-280VAC	180-280VAC
Load Voltage Range	48V-530V	48V-600V	24V-530V	48V-660V
Load Current	20A	20A	20A	20A
Mounting Type	DIN Rail	DIN Rail	DIN Rail	Chassis Mount, DIN Rail
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
Package Type	SSR with Integrated Heat Sink	SSR with Integrated Heat Sink	Module	Module
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

DR2260A20U (Sensata-Crydom): This substitute maintains manufacturer continuity with Sensata-Crydom and offers extended load voltage capability (48V-600V). The part is Active status with ROHS3 compliance. Input voltage accepts both AC and DC at 90-280V range. The integrated heat sink package matches the CKRA4820 form factor. This substitute provides the highest compatibility for direct replacement in existing designs.

GNR20ACZH (Crouzet): This substitute extends load voltage range to 660V and supports both Chassis Mount and DIN Rail configurations. RoHS compliance is confirmed. Input voltage range is 180-280VAC, which covers the upper portion of the CKRA4820 specification. The module package type differs from the integrated heat sink design. This substitute is suitable for applications where the 180-280VAC input range is acceptable.

ASR-SV480A20ZY-L (Altran Magnetics, LLC): This substitute maintains the 48V minimum load voltage and supports up to 530V, matching the CKRA4820 load voltage envelope. Input voltage is 90-280VAC. ROHS3 compliance is confirmed. The module package type differs from the integrated heat sink design. This substitute is suitable for applications where the module form factor is acceptable.

Frequently Asked Questions (FAQ)

Q: Can DR2260A20U replace CKRA4820 in all applications? A: DR2260A20U is compatible with CKRA4820 applications where load voltage does not exceed 600V and input voltage is within 90-280VAC/DC range. The extended load voltage capability of DR2260A20U (600V vs. 530V) provides additional operational margin.

Q: What is the difference between SSR with Integrated Heat Sink and Module package types? A: SSR with Integrated Heat Sink includes thermal management integrated into the component housing. Module packages require external thermal management consideration. Both package types support the same electrical specifications and DIN Rail mounting.

Q: Is GNR20ACZH suitable for applications requiring 90-120VAC input? A: No. GNR20ACZH input voltage range is 180-280VAC. Applications requiring 90-120VAC input must use DR2260A20U or ASR-SV480A20ZY-L.

Q: Are all substitute parts RoHS compliant? A: Yes. DR2260A20U and ASR-SV480A20ZY-L are ROHS3 Compliant. GNR20ACZH is RoHS Compliant. All substitutes meet RoHS requirements.

Q: Can ASR-SV480A20ZY-L operate at 48V load voltage? A: Yes. ASR-SV480A20ZY-L load voltage range is 24V-530V, which includes 48V operation and covers the full CKRA4820 load voltage specification.

Q: What is the primary reason to select a substitute for CKRA4820? A: CKRA4820 is designated Last Time Buy, indicating production discontinuation. Substitute parts with Active status ensure continued component availability for new designs and field replacements.

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