Weidmüller 8556040000 General Purpose Relay SPDT 6A 48V - Equivalent & Substitute Parts

Part Overview

The Weidmüller 8556040000 is a general purpose relay with SPDT (Single Pole Double Throw) contact configuration, rated for 6A at 48VAC/DC coil voltage. This relay is designed for DIN rail mounting with screw terminal connections and includes a lighted indicator and socket. The product is currently obsolete, making identification of equivalent substitute parts essential for system maintenance, repair, and component sourcing.

Substiute Parts

8556040000

WeidmüllerIn Stock: 7698556040000 Datasheet

Current PartRFQ

1122790000

WeidmüllerIn Stock: 7981122790000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Weidmüller 8556040000 is determined by the following critical parameters:

• Coil voltage: 48VAC/DC
• Contact configuration: SPDT (1 Form C)
• Current rating: 6A minimum
• Mounting type: DIN Rail
• Termination style: Screw Terminal
• Relay type: General Purpose
• Switching voltage capability: 250VAC or greater

The substitute part Weidmüller 1122790000 meets all mandatory substitution criteria. Both parts share identical coil voltage, contact form, current rating, mounting type, and termination style. The substitute is from an active product series (TERMSERIES) and maintains full functional compatibility for applications requiring general purpose relay switching at the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The Weidmüller 1122790000 is a direct functional substitute for the obsolete 8556040000. Both relays are RoHS compliant and REACH unaffected, meeting current regulatory requirements. The substitute part is from an active product series with current manufacturing support and inventory availability.

Selection of the 1122790000 is appropriate for applications where the 8556040000 is no longer available. The substitute maintains electrical compatibility across all critical parameters: coil voltage, contact configuration, current rating, mounting interface, and termination method. Both parts are classified as general purpose relays suitable for standard switching applications on DIN rail installations.

Frequently Asked Questions (FAQ)

Q: Can the Weidmüller 1122790000 directly replace the 8556040000 in existing installations?

A: Yes. Both relays share identical coil voltage (48VAC/DC), contact form (SPDT), current rating (6A), DIN rail mounting, and screw terminal connections. The substitute is electrically and mechanically compatible for direct replacement.

Q: What are the differences between these two relay models?

A: The primary differences are contact material (Silver Tin Oxide versus Silver Nickel), operating temperature range (-25°C to 50°C versus -40°C to 60°C), and switching response times (6ms operate/release versus 9ms operate/23ms release). The substitute offers extended temperature operation and different contact metallurgy.

Q: Are both relays RoHS compliant?

A: Yes. Both the 8556040000 and 1122790000 are RoHS compliant and REACH unaffected.

Q: What is the packaging difference between these parts?

A: The 8556040000 is supplied with standard packaging, while the 1122790000 is supplied in bulk packaging. Both are suitable for component integration into control systems.

Q: Why is the 8556040000 marked as obsolete?

A: The 8556040000 from the MRS series has been discontinued by Weidmüller. The 1122790000 from the active TERMSERIES represents the current product offering for this relay category.