Differential protection relays type "B" (AC and DC fault current) for industrial applications (DIN rail - AC auxiliary voltage)
Dimensions A x B x C (mm):
105 x 90 x 64 mm
Last items in stock
Differential protection relays type "B" (AC and DC fault current) for industrial applications (DIN rail - DC auxiliary voltage)
Dimensions A x B x C (mm):
105 x 90 x 64 mm
Out of stock - Delivery time 4 weeks
Differential protection relays type "B" (AC and DC fault current) for industrial applications (Panel mount - AC auxiliary voltage)
Dimensions A x B x C (mm):
98 x 96 x 73 mm
Out of stock - Delivery time 4 weeks
Differential protection relays type "B" (AC and DC fault current) for industrial applications (Panel mount - DC auxiliary voltage)
Dimensions A x B x C (mm):
98 x 96 x 73 mm
Out of stock - Delivery time 4 weeks
Differential protection relays type "A" (AC fault currents) for industrial applications (Panel mount - AC auxiliary voltage)
Dimensions A x B x C (mm):
98 x 96 x 73 mm
Out of stock - Delivery time 4 weeks
Differential protection relays type "A" (AC fault currents) for industrial applications (DIN rail - AC auxiliary voltage)
Dimensions A x B x C (mm):
36 x 90 x 64 mm
Out of stock - Delivery time 4 weeks
Type A differential: DER3 upgraded to DER4
The DER3 family, suitable for general use (type A differential), is now being replaced by the DER4 family.
- Two-wire cable
The innovation that stands out most is the wiring to the coil, which is now a 2-wire cable instead of 4-wire. This makes installation faster and easier, plus it reduces the risk of wiring problems.
- Time delay
As with the older series, the new DER4 devices allow you to set not only the tripping threshold, but also a time delay. This will stop the occasional spike from causing a false alarm when you switch on the device.
- Multiple diameters
The device can be used for medium to large installations (up to 1000s of amperes), depending on the diameter of the measuring coil that the relay is combined with.
Type B differential: DER3-DUAL upgraded to DER4B
The DER3-DUAL family is now being replaced by the DER4B series. This range is designed for differential monitoring in installations where there might be a DC component in the fault current (such as electric vehicle chargers and frequency converters).
- Detects AC and DC leakage currents
The DER4B is the big brother of the DER4. On top of AC leakage currents, it also detects DC ones.
- Early warning alarm
The new version also features an early warning alarm when the power supply is about to switch off.
- Just one coil: TBxxx
With this new generation DER4B, only one coil (TB80, TB110, TB180, …) is needed, which is connected with 2 wires, instead of the two coils with 4 wires each. This makes for a simpler and more reliable installation.
- Compact DIN rail version
While the form factor of the door-mounting version is unchanged, the DIN-rail version is now half as wide: 3 DIN instead of 6 DIN.
- RS-485 link
These devices are available in an RS-485 version, which allows you to link up to a building management system (BMS).