SMS03 Equivalent & Substitute Parts Reference

Part Overview

The SMS03 is an interlock magnetic DPST switch manufactured by Carlo Gavazzi Inc., designed for non-contact magnetic actuation applications. This component operates at 100VAC with a 250mA AC current rating and features wire lead termination. The SMS03 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations.

Substiute Parts

SMS03

Carlo Gavazzi Inc.In Stock: 767SMS03 Datasheet

Current PartRFQ

MC88CH2ORA2

Carlo Gavazzi Inc.In Stock: 933MC88CH2ORA2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMS03 is based on the following critical parameters:

• Magnetic actuation principle: Both the main part and substitute must operate via magnetic field detection without mechanical contact
• Switching function: Equivalent parts must provide normally open (NO) contact output capability
• Voltage compatibility: Supply voltage must accommodate the 100VAC requirement or provide compatible control voltage for integrated driver circuits
• Current handling: Substitute must support minimum 250mA AC switching capacity
• Environmental sealing: IP67 rating indicates dust-tight and waterproof operation; substitutes must maintain equivalent or superior environmental protection
• Operating temperature: Functional range of -25°C to 70°C establishes baseline thermal compatibility
• Termination interface: Wire lead connections define the physical integration method

The MC88CH2ORA2 qualifies as a manufacturer-recommended substitute based on Carlo Gavazzi Inc.'s engineering designation, despite differences in circuit topology and supply voltage specification.

Parameter Comparison

Engineering Selection Recommendations

The MC88CH2ORA2 is designated as the manufacturer-recommended substitute for the obsolete SMS03. This substitution is supported by Carlo Gavazzi Inc.'s active product status and continued availability (853 units in stock). The MC88CH2ORA2 operates on 12V to 24V supply voltage, requiring integration with appropriate voltage conversion or control circuitry when replacing 100VAC applications.

The extended operating temperature range of the MC88CH2ORA2 (-25°C to 80°C) provides improved thermal margin compared to the SMS03 specification. Both components employ non-contact magnetic actuation principles and deliver normally open switching output.

Termination differences (wire leads versus cable) and mounting configuration (flange mount) necessitate mechanical redesign of the installation interface. These physical modifications are standard engineering considerations when transitioning from obsolete to active component families.

Frequently Asked Questions (FAQ)

Q: Can the MC88CH2ORA2 directly replace the SMS03 without circuit modifications?

A: Direct mechanical and electrical replacement is not possible. The MC88CH2ORA2 requires 12V to 24V supply voltage, whereas the SMS03 operates at 100VAC. System voltage conversion or control circuit redesign is necessary. Additionally, termination style differs (cable versus wire leads) and mounting configuration changes from the original design.

Q: What are the key compatibility criteria for SMS03 substitutes?

A: Substitutes must provide magnetic non-contact actuation, normally open switching output, minimum 250mA current handling capability, IP67 environmental protection, and operating temperature compatibility within the -25°C to 70°C range. Supply voltage and termination style may vary based on system integration requirements.

Q: Why is the MC88CH2ORA2 classified as a reed switch rather than a magnetic switch?

A: Reed switches are a specific implementation of magnetic switching technology. The MC88CH2ORA2 uses sealed reed contacts actuated by magnetic field, providing the same non-contact switching principle as the SMS03 while offering active product status and improved availability.

Q: Are there packaging considerations when implementing the MC88CH2ORA2?

A: Yes. The MC88CH2ORA2 is supplied in bulk packaging with flange mount configuration, whereas the SMS03 used wire lead termination. Installation requires appropriate mechanical mounting hardware and cable routing compatible with the flange mount interface.

Q: What is the frequency specification of the MC88CH2ORA2?

A: The MC88CH2ORA2 is rated for 100 Hz operation, indicating suitability for applications requiring switching response up to this frequency threshold. The SMS03 frequency specification was not provided in the original documentation.