Sensata-Crydom S218 SSR Relay - Equivalent & Substitute Parts

Part Overview

The Sensata-Crydom S218 is a Solid State SPST-NO (1 Form A) relay module designed for AC load switching applications with zero-cross detection. This component operates with a 4.6–8VDC input and handles loads up to 8A at 20–140V. The S218 is classified as obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

S218

Sensata-CrydomIn Stock: 2245S218 Datasheet

Current PartRFQ

EZ240D12

Sensata TechnologiesIn Stock: 900EZ240D12 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S218 is determined by the following critical parameters:

• Circuit Configuration: Must be SPST-NO (1 Form A) to maintain identical switching logic
• Output Type: Must support AC with zero-cross detection for compatible load switching behavior
• Mounting Type: Must be Chassis Mount to fit existing mechanical installations
• Termination Style: Quick Connect terminals must match or be mechanically compatible with system wiring
• Input Voltage Range: Must encompass or overlap the 4.6–8VDC specification
• Load Voltage and Current Ratings: Substitute must meet or exceed the 20–140V and 8A requirements

The EZ240D12 satisfies these substitution criteria while offering enhanced electrical ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

The EZ240D12 is a direct functional substitute for the obsolete S218. Both components share identical circuit configuration (SPST-NO), output type (AC with zero-cross detection), and mounting methodology (Chassis Mount). The EZ240D12 provides superior electrical performance with higher input voltage tolerance (3–15VDC vs. 4.6–8VDC), extended load voltage capability (24–280V vs. 20–140V), and increased current capacity (12A vs. 8A).

The EZ240D12 holds active product status and carries ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. Both components maintain REACH Unaffected status. The primary design consideration is the termination connector size difference: the EZ240D12 uses 0.250" (6.3mm) Quick Connect terminals versus the S218's 0.187" (4.7mm) terminals, requiring mechanical adapter evaluation or wiring harness modification during integration.

Frequently Asked Questions (FAQ)

Q: Can the EZ240D12 directly replace the S218 without modifications?

A: The EZ240D12 provides functional equivalence in circuit operation, input/output type, and mounting configuration. However, the termination connector size differs (0.250" vs. 0.187"), necessitating mechanical compatibility assessment or wiring harness adaptation.

Q: What are the key differences in electrical ratings?

A: The EZ240D12 exceeds S218 specifications across all electrical parameters: input voltage range expands from 4.6–8VDC to 3–15VDC, load voltage extends from 20–140V to 24–280V, and current capacity increases from 8A to 12A. These enhancements provide design margin and broader application flexibility.

Q: Why is product status relevant for component selection?

A: The S218 is classified as obsolete, indicating discontinued manufacturing and limited future availability. The EZ240D12's active status ensures ongoing supply chain access, technical support, and compliance with current regulatory standards.

Q: Are there compliance differences between these components?

A: Both components maintain REACH Unaffected status. The EZ240D12 carries ROHS3 compliance certification, whereas the S218 compliance status is not specified. This distinction may be relevant for applications subject to RoHS regulatory requirements.

Q: What mounting considerations apply to substitution?

A: Both components are Chassis Mount modules with identical mechanical mounting methodology. The primary integration consideration is the Quick Connect terminal size difference, which may require connector adapter evaluation or harness redesign depending on existing system architecture.