ABB RA4 Interface Relay for AF...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$316.77
ABB RA4 Interface Relay for AF09-AF96 Contactors

ABB RA4 Interface Relay for AF09-AF96 Contactors

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Model: AF-RA4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$316.77
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ABB RA4 Interface Relay for AF09-AF96 Contactors

The ABB RA4 Interface Relay is engineered to receive 24 V DC signals delivered by PLCs or other low-output-power sources and restore them with sufficient power to operate the coils of ABB's AF09 ... AF96 contactors or NF contactor relays. Built around a miniature electromechanical relay with a N.O. contact and a low-consumption 24 V DC coil, the RA4 gives control panel builders a compact, reliable way to bridge PLC control signals to power contactor coils while guarding against the overvoltages that shorten component lifetime.

Key Features

  • Low-Power Signal Interface: Receives 24 V DC signals from PLC outputs with low output power and restores them with the power needed to operate AF09 ... AF96 or NF contactor coils.
  • Miniature Electromechanical Relay: Equipped with a N.O. contact and a low-consumption 24 V DC coil, with the coil controlled by the PLC while the N.O. contact switches the power contactor.
  • Built-In Surge Protection: Protected from coil-switching overvoltage thanks to the built-in surge protection of the AF09 ... AF96 contactor line, helping preserve electronic devices, insulators, and overall component life.
  • Reverse-Polarity Protection: A diode inserted between the E1 and E2 input terminals protects the RA4 against relay pole reversal.
  • Simple Terminal Connection: E1+ and E2- input terminals connect according to polarity to the PLC output, while two terminal pads connect to the A1 and A2 terminals of the contactor coil, which is supplied between the A0 and A2 terminals of the RA4.
  • Tool-Free Mounting: Remove the coil terminal block from the contactor and clip the RA4 interface relay into place without any screwing operation.

Technical Specifications

  • Country of Origin: UKN
  • Packaging: 1 ea

Typical Applications

  • PLC-to-Contactor Control Signal Interfacing
  • Industrial Control Panel and Motor Control Center Wiring
  • AF09 ... AF96 Contactor Coil Switching
  • NF Contactor Relay Control Circuits
  • Low-Voltage Automation and Machine Control Systems

Why ABB?

ABB engineers the RA4 interface relay to work hand-in-hand with its AF09 ... AF96 contactor line, pairing a low-consumption 24 V DC coil with built-in surge protection and reverse-polarity protection for dependable PLC-to-contactor control. The tool-free clip mounting and straightforward E1/E2 and A1/A2/A0 terminal layout make the RA4 a practical, code-compliant choice for professional control panel builders who need consistent, long-lasting switching performance.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Interface Relay
Series:
RA4
Voltage Rating:
24VDC
Country of Origin:
Unknown
Department:
Electrical
Product Group:
Motor Control & Automation
Product Subgroup:
Contactors & Relays

ABB AF-RA4 – Frequently Asked Questions

1) Can a 24V DC PLC output drive an ABB AF contactor coil directly, or do I need the RA4?
That's exactly the gap the RA4 fills. Many PLC outputs are 24 V DC but low output power, not enough to pull in an AF contactor coil. The RA4 takes the 24 V DC signal on its own low-consumption 24 V DC coil and switches a normally open contact that carries the power to the contactor coil. If your PLC card already has the output power to pull the coil, you don't need it.
2) How does the RA4 mount to the contactor, and do I need tools or a DIN rail?
No tools and no separate rail. You pull the coil terminal block off the AF contactor and clip the RA4 into its place. There is no screwing operation involved, so it adds no panel width beside the contactor.
3) How do I wire the ABB RA4 terminals?
Input side: E1+ and E2- go to the PLC output, observed for polarity. Output side: two terminal pads land on the contactor coil's A1 and A2 terminals, and the coil is supplied between the RA4's A0 and A2 terminals. Get the E1/E2 polarity right, though a diode between E1 and E2 protects the unit if the poles are reversed.
4) Does the RA4 protect against coil switching spikes, or do I need a separate surge suppressor?
Two layers are already there. A diode across the E1/E2 input guards the RA4 against reverse polarity, and the AF09 to AF96 contactor line's own built-in surge protection covers the coil-switching overvoltage. That is what keeps the relay and the PLC output card from being chewed up over time.
5) What part number do I order for the ABB RA4 interface relay, and how is it packed?
Order ABB part AF-RA4, the RA4 series interface relay. It ships one each, so for a panel with six AF contactors on PLC control you need six of them.
6) Will the RA4 accept a 120V AC control signal from my PLC?
No. The RA4's input coil is 24 V DC only, and the E1+/E2- terminals are polarity sensitive. A 120 V AC output card is the wrong source for it; you need a 24 V DC PLC output or a different interface.
7) Is the RA4 a solid state relay or a mechanical one?
Mechanical. It's a miniature electromechanical relay with a single normally open contact, driven by a low-consumption 24 V DC coil. The PLC drives that coil; the N.O. contact does the switching to the power contactor.
How fast can I get the ABB AF-RA4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the ABB AF-RA4 come with a warranty?
Absolutely. The ABB AF-RA4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the ABB AF-RA4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the ABB AF-RA4 from ZenSupply?
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