NK DS1-SDTL-24U-FD - DC Current Switch, DS1 Series

DS1-FD Current Relays monitor AC or DC loads: motor, crane, or welding equipment. The relay features a large aperture and solid-core design that allows for quick installation, just thread the conductor through the sensing window (aperture) and reconnect on the other side. The relay output is isolated from the monitored circuit and can switch up to two amps up to 125 VAC, or two amps to 30 VDC. The output contacts can reset to original condition on current fall or latch in the tripped condition. The trip point (where the output relay changes state) can be adjusted between 20 and 400 amps by adjusting two potentiometers. One provides a “coarse” adjustment; the second allows for fine tuning of the trip point. The sensor mounts on a back panel or a DIN rail and is designed to accommodate wire sizes for loads up to 400 amps or higher. The maximum current is unlimited, so current higher than the highest adjustment point will keep the relay in the tripped condition.

DC Motors

Current Relay Applications

Welding Processes

• Detect time of use using the normally open contact, which is closed with DC current over the trip point.

• If the power to the field of a shunt wound DC motor is lost, the speed will be uncontrollable. The normally closed contact will be open in normal operating conditions and closed to alarm if the field power is lost. Alternatively, the normally open contact could be closed during normal conditions and open the circuit to a contactor coil if the monitored circuit’s current fell below the trip point.

Current Relay Features

Factory Calibrated and Warranted For Five Years

• Trip point to 400 ADC or 338 AAC.
• Sensor is not polarity sensitive with regard to the monitored circuit.
• Designed for longest life and reliability.

• Can control an AC or DC circuit.
• Compatible with most automation and control systems.
• Both NO contact for alarm (closing on current rise) and NC contact (opening on current rise) for disconnecting applications.
• Automatic reset or latching output available.
• Dual potentiometers allow for accurate trip point adjustment.

• Simple and reliable connection.

• Sensing window provides ample space for single or multiple conductors.

• Simply snap onto a DIN rail or attach with screws to a panel for secure mounting.

• Accepted worldwide.

Current Relay Connections

Latching

Auto Reset

Current Relay Ordering Information

Sample Model Number: DS1-SDTA-24U-FD

DC current operated relay, 20–400 ADC adjustment range, SPDT relay output, 24 VAC/DC powered, panel or DIN rail mounting.