Knife fuse switches, also known as fuse disconnect switches, are an switching appliance composed of a circuit breaker and a fuse. It is a multi-pole manually operated switch with a shell made of P0 grade flame retardant material. It has high flame retardant performance, protective capabilities and reliable operating safety.
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The main advantage of the circuit breaker is that the cutter and fuse are integrated into one, making the structure simpler and saving space.
When closed, the fuse makes electrical contact with the internal copper, making the circuit unblocked. When the power is off, the fuse separates from the live copper contacts, thus breaking the circuit.
In addition, the fuse disconnect switches can ensure that the circuit is connected and disconnected under load, and has reliable safety breaking protection against overcurrent or short circuit.
The disconnection status is clearly visible. It has strong resistance to moisture and heat. The switch has beautiful appearance, novelty, simplicity, small size and complete functions. It is the best choice among similar products.
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Fuse disconnect witches can be equipped with fuse monitors, namely DNH1 electronic fuse monitoring device and DNH1 motor fuse monitoring device.
This is an additional circuit monitoring device based on the fuse disconnect witches, which can protect circuit safety in real time.
DNH1 electronic fuse monitoring device can monitor the working status of the fuse in real time. When the fuse blows, the corresponding fault location can be displayed through the panel LED light, reducing maintenance time and enabling remote monitoring.
There are five indicator lights on its shell, namely Run, A, B, C, and Power. The green wiring port below can be connected to the indicator lights in the remote monitoring room to achieve remote alarm. The Run indicator color is green, and the rest are red.
When Run flashes green light and all other lights are off, it means that the fuse core and power supply are in normal operation; when Run flashes green light and any indicator light A, B, or C is always on, it means the corresponding phase fuse If the wire is blown, a remote alarm will be triggered, and the power supply needs to be cut off manually to protect the load motor;
the power indicator light is an alarm light. When one phase of the power supply is cut off, the power indicator light will light up. At the same time, the power indicator light in the remote monitoring room The indicator light will also sound an alarm.
DNH1 motor fuse monitoring device can also monitor the working status of the fuse in real time. When we press the black button, it means that the power is on and the circuit is operating normally.
When one phase fuse is blown, the red button will automatically jump and cut off three phase current to protect the load motor. At the same time, the green wiring port below it can also be connected to a remote indicator light to achieve remote alarm.
