Purchase now: Kuhnke UF3G-24VDC Industrial Plug-in Relay
Purchase now: Atlantechdrives provides you the UF3G-24VDC, a highly dependable, industrial-grade 11-pin plug-in supply relay manufactured by the automation experts at Kendrion Kuhnke. In complex control panels, electrical signals often require amplification, multiplication, or strict galvanic isolation to protect delicate Programmable Logic Controllers (PLCs). The UF3G-24VDC serves exactly this purpose. Featuring a highly efficient 24V DC electromagnetic coil, this relay can be driven directly by standard transistor outputs from your main PLC. Once energized, its robust internal mechanical contacts can safely switch much higher electrical loads—up to 4 Amps at 250V AC. This makes it the absolute perfect intermediary component for controlling heavy-duty AC motor contactors, massive industrial solenoid valves, or powerful factory alarms without risking severe electrical feedback that could instantly destroy the sensitive silicon logic board of your primary automation controller. Designed with an industry-standard 11-pin circular plug-in base, it allows maintenance technicians to rapidly swap a failed relay without ever needing to unscrew a single electrical wire, drastically reducing machine downtime.
Technical Specifications of the Kuhnke UF3G-24VDC
- Part Number: UF3G-24VDC
- Manufacturer: Kendrion Kuhnke
- Component Type: Electromechanical Plug-in Relay
- Coil Voltage: 24V DC (Direct Current)
- Contact Configuration: 3PDT (3 Form C Changeover Contacts)
- Maximum Switching Voltage: 250V AC
- Maximum Switching Current: 4 Amps
- Base Type: 11-Pin Circular (Socket required)
Expert Tips: Managing Inductive Kickback and Flyback Diodes
While the UF3G-24VDC is a robust switching device, the way you wire the 24V DC coil is critical for PLC survival. Expert Tip: When the PLC turns off the 24V DC signal to the relay coil, the collapsing magnetic field inside the relay generates a massive, instantaneous high-voltage spike (inductive kickback) that travels backward up the wire. To prevent this spike from blowing out your PLC output card, you must install a flyback diode (freewheeling diode) in parallel across the relay coil terminals, or use an 11-pin relay socket that features an integrated diode module. This safely dissipates the reverse voltage and protects your expensive electronics.
Installation Advice: Contact Arcing and Snubber Circuits
When using the UF3G-24VDC contacts to switch heavy inductive AC loads (like a large solenoid coil or a motor brake), the physical separation of the contacts will cause an electrical arc to jump across the air gap. Over time, this arcing physically melts and pits the silver contacts, eventually causing the relay to weld shut or fail to conduct. If you are switching highly inductive 250V AC loads, it is highly recommended to install an RC snubber circuit (a resistor and capacitor in series) across the load to suppress the arc and drastically extend the mechanical lifecycle of the relay.
Frequently Asked Questions (FAQs)
Q: Does the UF3G-24VDC relay include the 11-pin mounting socket?
A: No. The UF3G-24VDC is strictly the plug-in relay itself. The corresponding 11-pin DIN-rail mountable socket (often referred to as a relay base) must be purchased and installed separately within your control cabinet to accept the relay.
Q: Can I use this relay to switch low-voltage analog signals?
A: Standard power relays with silver alloy contacts require a minimum «wetting voltage» and current to burn through microscopic oxidation on the contacts. Using a 4A power relay to switch a delicate 0-10V analog signal or a thermocouple millivolt signal is highly discouraged, as the signal will be corrupted by contact resistance.
Do you need more references from this brand? Explore our full catalog of Kuhnke here.
