Samwha dsp Tense GKM-11 Single Phase Over & Under Voltage Control Relay

The GKM-11 is an analog adjustable single phase voltage protection relay engineered to continuously safeguard single phase electrical machinery, automation circuits, and electronic appliances from volatile grid fluctuations. Housed in a compact, modular enclosure optimized for standard 35 mm DIN rail installations, this control terminal actively monitors the incoming voltage line. It isolates connected loads whenever the system experiences high voltage spikes or severe low voltage sags.

Key Features

Analogue Calibration Potentiometers: Outfitted with four independent teal adjustment dials, providing quick manual customization of voltage limits and time thresholds directly in the field.
Adjustable Over Voltage Threshold ( $HV$ ): Allows operators to configure the high voltage trip limit from 230V to 300V AC, including an “Off” setting to completely disable over voltage intervention.
Adjustable Under Voltage Threshold ( $LV$ ): Provides selectable low voltage brownout protection ranging from 150V to 210V AC, with an integrated “Off” disable position.
Dual Time Calibration Dials ( $DT$ / $RT$ ): Features a Delay Time potentiometer ( $DT$ : 0.5–20 sec) to filter out harmless momentary voltage dips, alongside an active Reset Time potentiometer ( $RT$ : 0.5–20 sec) to ensure the grid stabilizes before load reconnection.
4 LED Operational Diagnostics Array: Employs front facing visual indicators High Voltage error ( $HV$ ), Low Voltage error ( $LV$ ), and an output relay contact status indicator for immediate troubleshooting.
Clear Interface Labeling: Designed with unambiguous bottom entry wiring ports labeled for Line ( $L$ ), Neutral ( $N$ ), and dry relay contacts ( $1, 2, 3$ ) to simplify installation paths.

Technical Specifications

Feature	Specification
Model Number	GKM-11
Brand Recognition	Samwha dsp / Tense Electronics
Device Instrument Typology	Single Phase Over & Under Voltage Control Relay
Nominal Operating Voltage ( $U_n$ )	220V AC
Grid Operating Frequency	$50 / 60text{ Hz}$ dual system capability
Over Voltage Range ( $HV$ )	$230text{V} - 300text{V AC}$ Off selectable
Under Voltage Range ( $LV$ )	$150text{V} - 210text{V AC}$ Off selectable
Delay ( $DT$ ) & Reset ( $RT$ ) Range	$0.5text{ sec.} - 20text{ sec.}$ independent adjustments
Output Contacts Configuration	1 SPDT relay contact rated at 5A / 250V AC (Resistive Load)
Form Factor Compatibility	Standard 35 mm DIN Rail Snap on Enclosure

Applications

Single Phase Motor and Pump Protection: Guarding single phase agricultural pumps, extraction fans, and air compressors against terminal winding failure caused by localized low voltage brownouts.
Residential & Office Equipment Enclosures: Protecting downstream household appliances, office server racks, and delicate networking hubs from sudden utility power surges.
HVAC Control Panel Isolation: Serving as a reliable, line side guard inside air handling units to prevent contactor chattering or compressor burnout during heavy commercial utility loads.
Industrial PLC Power Supply Feeders: Mounted on the input stage of automation cabinets to safeguard 24V DC switch mode power supplies (SMPS) from volatile incoming phase drops.