RUMF21FD General Purpose Relay DPDT 110VDC Equivalent & Substitute Parts

Part Overview

The RUMF21FD is a general purpose relay manufactured by Schneider Electric from the Harmony series. This socketable DPDT (2 Form C) relay operates on 110VDC coil voltage with a contact rating of 10A at 250VAC or 28VDC maximum switching voltage. The part is currently active in production with 655 pieces in stock.

Equivalent and substitute parts are identified when component availability changes, supply chain disruptions occur, or when design flexibility permits selection from qualified alternatives that maintain identical electrical and mechanical performance within the specified parameter envelope.

Substiute Parts

RUMF21FD

Schneider ElectricIn Stock: 725RUMF21FD Datasheet

Current PartRFQ

RUMC21FD

Schneider ElectricIn Stock: 859RUMC21FD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUMF21FD is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Coil voltage: 110VDC
• Contact form: DPDT (2 Form C)
• Contact current rating: 10A
• Switching voltage: 250VAC, 28VDC maximum
• Coil current: 15.1 mA
• Coil resistance: 7.3 kOhms
• Must operate voltage: 88VDC
• Must release voltage: 11VDC
• Operate time: 20 ms
• Release time: 20 ms

Mechanical Parameters:

• Mounting type: Socketable
• Termination style: Plug In
• Contact material: Silver Nickel (AgNi)
• Operating temperature: -40°C to 55°C

Functional Features:

• Coil type: Non Latching
• Test button: Present
• Relay type: General Purpose

The RUMC21FD meets all specified electrical and mechanical parameters and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Both RUMF21FD and RUMC21FD are active production parts from Schneider Electric's Harmony series with identical electrical specifications, mechanical configurations, and regulatory certifications (CSA, EAC, UL). Selection between these parts is based on availability and inventory status.

Current inventory levels are:

• RUMF21FD: 655 pieces
• RUMC21FD: 769 pieces

Both parts carry the same ECCN (EAR99) and HTSUS (8536.49.0075) classifications. The RUMC21FD includes RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating documentation.

For applications requiring documented RoHS3 compliance, the RUMC21FD is the appropriate selection. For general applications where RoHS documentation is not a requirement, either part provides equivalent performance.

Frequently Asked Questions (FAQ)

Q: Can RUMC21FD be used as a direct replacement for RUMF21FD?

A: Yes. The RUMC21FD is a parametric equivalent with identical coil voltage (110VDC), contact form (DPDT), current rating (10A), switching voltage (250VAC/28VDC), timing characteristics (20ms operate/release), and socketable plug-in termination. Both parts are from the Harmony series and carry the same regulatory approvals.

Q: Are there any differences in socket compatibility?

A: No. Both parts use identical socketable mounting and plug-in termination styles. They are mechanically interchangeable in the same relay socket.

Q: What is the difference between RUMF21FD and RUMC21FD?

A: The parts are electrically and mechanically identical. The RUMC21FD includes documented RoHS3 compliance and MSL Level 1 rating. Both are active production parts with full regulatory certifications.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. If RoHS3 compliance documentation is required for the application, specify RUMC21FD. Both parts meet identical electrical and mechanical requirements.

Q: Are the coil specifications identical?

A: Yes. Both parts have 110VDC coil voltage, 15.1 mA coil current, 7.3 kOhms coil resistance, 88VDC must-operate voltage, and 11VDC must-release voltage.

Q: What is the operating temperature range for both parts?

A: Both RUMF21FD and RUMC21FD operate across -40°C to 55°C.

Q: Are the contact materials the same?

A: Yes. Both parts use Silver Nickel (AgNi) contact material rated for 10A at 250VAC or 28VDC maximum switching voltage.