RMIA45024AC General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The RMIA45024AC is a general purpose relay manufactured by Carlo Gavazzi Inc., featuring a 4PDT (4 Form C) contact configuration with a 24VAC coil and 5A contact rating. This socketable relay is designed for industrial control applications requiring reliable switching of AC loads up to 230VAC. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement in existing installations.

Substiute Parts

RMIA45024AC

Carlo Gavazzi Inc.In Stock: 1128RMIA45024AC Datasheet

Current PartRFQ

RRM004A24V

Carlo Gavazzi Inc.In Stock: 892RRM004A24V Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RMIA45024AC is determined by the following critical parameters:

Primary Compatibility Criteria:

• Contact form must be 4PDT (4 Form C)
• Coil voltage must be 24VAC
• Contact rating must be 5A minimum
• Mounting type must be socketable
• Termination style must be plug-in compatible

Secondary Compatibility Criteria:

• Operating temperature range must encompass the application environment
• Must operate and release voltages must be compatible with control circuit design
• Contact material and switching voltage ratings must support the intended load

The RRM004A24V meets all primary and secondary compatibility criteria, establishing it as a direct substitute for the obsolete RMIA45024AC in socketable relay applications.

Parameter Comparison

Engineering Selection Recommendations

The RRM004A24V is the qualified substitute for the obsolete RMIA45024AC based on the following engineering factors:

Functional Equivalence: Both relays share identical contact form (4PDT), coil voltage (24VAC), contact rating (5A), and control voltage thresholds (19.2VAC pickup, 7.2VAC dropout). Socket and plug-in termination compatibility ensures direct mechanical and electrical replacement without circuit board modifications.

Performance Characteristics: The RRM004A24V demonstrates improved switching speed (20 ms versus 25 ms for both operate and release times), which may benefit applications requiring faster response. The higher maximum switching voltage rating (250VAC/30VDC versus 230VAC) provides additional design margin for AC load applications.

Operational Considerations: The RRM004A24V operates within a narrower low-temperature range (-40°C versus -55°C minimum), which must be evaluated against specific application requirements. The increased coil current (125 mA versus 36.9 mA) requires verification that control circuit power supplies and switching components can accommodate the higher demand.

Compliance Status: Both components carry identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications. The RRM004A24V includes CE, CSA, and UR approvals, providing additional regulatory documentation for applications requiring third-party certification.

Frequently Asked Questions (FAQ)

Q: Can the RRM004A24V directly replace the RMIA45024AC without circuit modifications?

A: Yes, for applications operating within the RRM004A24V temperature range (-40°C to 70°C). The identical contact form, coil voltage, control thresholds, and socketable termination enable direct substitution. However, the increased coil current (125 mA versus 36.9 mA) must be verified against control circuit power supply capacity.

Q: What is the impact of the different coil resistance values?

A: The RRM004A24V coil resistance of 192 Ohms versus 650 Ohms in the RMIA45024AC results in the higher coil current draw. This affects power consumption and heat generation but does not prevent substitution if the control circuit power supply is rated for the higher current demand.

Q: Are there temperature limitations when substituting these relays?

A: The RRM004A24V minimum operating temperature is -40°C, compared to -55°C for the RMIA45024AC. Applications requiring operation below -40°C cannot use the RRM004A24V as a substitute. Verify the application's minimum operating temperature requirement before selection.

Q: How do the switching speed differences affect relay performance?

A: The RRM004A24V operates and releases 5 milliseconds faster than the RMIA45024AC. For most industrial control applications, this difference is negligible. Applications with critical timing requirements should evaluate whether faster switching provides benefit or requires circuit timing adjustments.

Q: What is the significance of the different contact materials?

A: The RMIA45024AC uses Silver Tin Oxide Indium Oxide (AgSnOInO) while the RRM004A24V uses Silver Tin Oxide (AgSnO). Both materials are suitable for general purpose switching. The contact material difference does not prevent substitution for standard AC load applications.

Q: Does the higher maximum switching voltage of the RRM004A24V affect compatibility?

A: No. The RRM004A24V rating of 250VAC/30VDC exceeds the RMIA45024AC rating of 230VAC, providing additional design margin. Applications operating at or below 230VAC are fully compatible.

Q: Are there packaging differences between these relays?

A: The RMIA45024AC is specified with "-" packaging notation, while the RRM004A24V is supplied in bulk packaging. Both are socketable relays with identical plug-in termination, ensuring mechanical compatibility in relay socket applications.