KS2634 BECKHOFF Bus Terminal 4-Channel Relay Output 250 VAC / 30 VDC

Product Overview

The KS2634 (KS2634) is a high-performance 4-channel relay output terminal designed for the modular Beckhoff Bus Terminal system. Featuring four independent make contacts (normally open), this module acts as a robust interface between the internal logic of the K-bus and high-power field devices. With a high switching capacity of up to 4 A per channel and support for voltages up to 250 VAC, the KS2634 is optimized for controlling AC/DC loads such as small motors, contactors, and solenoid valves. The "KS" designation signifies the inclusion of a pluggable wiring level, allowing for rapid terminal replacement without disconnecting individual field wires, which significantly reduces maintenance time and prevents wiring errors in critical automation environments like material handling and building management.

Technical Configuration

The hardware architecture of the KS2634 centers on mechanical relay technology, providing true potential-free switching and physical air-gap isolation. It is engineered for versatility, supporting both ohmic and inductive load types with rated currents of 4 A and 2 A respectively. The terminal features a high mechanical service life of 20 million cycles and utilizes an internal K-bus current of 120 mA for logic-side operations. A key technical advantage is its ultra-low minimum permitted load (0.1 mA at 0.1 VDC), allowing it to switch high-impedance signals or low-power electronic inputs with extreme reliability. The module is housed in a slim 12 mm form factor and provides 500 V electrical isolation between the logic and field levels.

Technical Specifications

Technical FAQs

What is the benefit of the KS-series pluggable wiring over the standard EL/KL series?

The KS2634 features a detachable wiring block. During service or system upgrades, the entire wiring plug can be removed from the terminal housing without loosening the individual spring-clamp connections. This "Permanent Wiring" concept ensures that the field installation remains intact, dramatically accelerating the replacement process and ensuring the machine returns to operation faster.

How should I protect the relay contacts when switching inductive loads?

While the KS2634 is rated for 2 A inductive loads, mechanical relays are susceptible to contact erosion caused by back-EMF. For DC inductive loads (e.g., solenoids), we strongly recommend installing a flyback diode. For AC inductive loads, an RC snubber circuit or varistor should be placed across the load to suppress arcing and maximize the electrical life of the relay.

Can this module be used to switch very small signals?

Yes. Unlike many high-power relays that require a minimum "wetting current" to break through surface oxidation on the contacts, the KS2634 is rated for loads as low as 0.1 mA at 0.1 VDC. This makes it suitable for interfacing with high-impedance inputs of other electronic controllers or sensors.

Engineering & Installation Guide

• Wiring Precision: The terminal utilizes spring-actuated connections. For optimal contact, use wires with a cross-section between 0.08 and 1.5 mm squared. Ensure the stripping length is strictly between 9 and 10 mm. Avoid over-tightening or using excessive force with the screwdriver to prevent damage to the pluggable terminal block.

• Mounting and Stability: Secure the module on a standard 35 mm DIN rail (EN 60715). Utilize the integrated double slot and key connection system to ensure a rigid mechanical bond with adjacent terminals. This is critical in high-vibration environments (conforming to EN 60068-2-6) to maintain electrical continuity across the K-bus power contacts.

• Total Current Management: The maximum current load for the power contacts is 10 A. If the sum of the currents across the four channels (and any downstream terminals) exceeds this value, a new power feed terminal (e.g., KL9010 or similar) must be inserted to prevent overheating of the internal power bus.