Weidmüller 8556050000 General Purpose Relay SPDT 6A 24V - Equivalent & Substitute Parts

Part Overview

The Weidmüller 8556050000 is a general purpose relay with SPDT (Single Pole Double Throw) contact configuration, rated for 6A at 24VAC/DC coil voltage. This relay is designed for DIN rail mounting and features a lighted indicator with socket inclusion. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and component sourcing in ongoing applications.

Substiute Parts

8556050000

WeidmüllerIn Stock: 9688556050000 Datasheet

Current PartRFQ

1122780000

WeidmüllerIn Stock: 9821122780000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Weidmüller 8556050000 is determined by the following critical parameters:

• Coil voltage: 24VAC/DC (must match)
• Contact form: SPDT (1 Form C) (must match)
• Contact rating: 6A minimum (must meet or exceed)
• Mounting type: DIN Rail (must match)
• Termination style: Screw Terminal (must match)
• Coil type: Non Latching (must match)

The Weidmüller 1122780000 satisfies all substitution criteria. While this part belongs to the TERMSERIES line rather than the MRS series, it maintains electrical and mechanical compatibility through identical coil voltage, contact configuration, current rating, mounting standard, and termination method. The substitute part is currently in active production status, addressing the obsolescence of the original component.

Parameter Comparison

Engineering Selection Recommendations

The Weidmüller 1122780000 is the direct functional equivalent for applications currently using the 8556050000. Selection is justified on the following basis:

• The substitute part maintains all critical electrical parameters: 24VAC/DC coil voltage, SPDT contact configuration, and 6A current rating
• Mechanical compatibility is preserved through identical DIN rail mounting and screw terminal termination
• The substitute part is in active production status, ensuring long-term availability and supply chain continuity
• RoHS compliance of the substitute part aligns with current regulatory requirements
• Extended operating temperature range (-40°C to 60°C versus -25°C to 50°C) provides broader environmental tolerance
• Switching voltage capability is enhanced with explicit 250VDC rating in addition to 250VAC

Timing parameter variations (operate time 6 ms versus 7 ms; release time 40 ms versus 9 ms) and contact material differences (Silver Nickel versus Silver Tin Oxide) are within acceptable tolerances for general purpose relay applications and do not preclude substitution in standard industrial control circuits.

Frequently Asked Questions (FAQ)

Q: Can the Weidmüller 1122780000 directly replace the 8556050000 in existing installations?

A: Yes. Both relays share identical coil voltage (24VAC/DC), contact form (SPDT), current rating (6A), mounting type (DIN Rail), and termination style (Screw Terminal). These parameters define functional compatibility for general purpose relay applications.

Q: What are the differences in timing between these two relays?

A: The 1122780000 operates slightly faster (6 ms versus 7 ms) but has a longer release time (40 ms versus 9 ms). These differences are characteristic of different relay designs and do not affect compatibility in standard control applications where timing precision is not critical.

Q: Why does the substitute part have a different contact material?

A: The 1122780000 uses Silver Nickel (AgNi) contact material while the 8556050000 uses Silver Tin Oxide (AgSnO). Both materials are standard for general purpose relays and provide equivalent performance in typical industrial switching applications.

Q: Is the substitute part RoHS compliant?

A: Yes. The Weidmüller 1122780000 is RoHS compliant. The original part's RoHS status was not specified in available documentation.

Q: What is the packaging difference between these parts?

A: The 8556050000 is supplied with standard packaging, while the 1122780000 is supplied in bulk packaging. This affects ordering and inventory management but does not impact the relay's electrical or mechanical function.

Q: Does the extended operating temperature range of the substitute part affect compatibility?

A: No. The substitute part's operating temperature range (-40°C to 60°C) encompasses the original part's range (-25°C to 50°C). This provides equal or better performance across all temperature conditions where the original part was specified.