Today, the product we are going to introduce is our Load Isolating Switch
The load isolating switch is a low-voltage electrical device in power systems that combines load current breaking capability and circuit isolation function. Compared with traditional isolating switches, it has an additional capability to break the normal operating load current (a function that traditional isolating switches lack).
Advantages
- Safe operation under load
- Integrated load-breaking/isolation functionality
- Normal load switching capability
- No-load/light-load operation capability
- Emergency breaking function
- Reduces power outage scope and improves power supply continuity
- Arc-extinguishing and arc-leakage prevention design
- Visible break points and clear status indication
How to Use a Load Isolating Switch
The use of a load isolating switch must strictly adhere to its functional positioning of “load-breaking/current-making + circuit isolation”. Prior to operation, the following three core inspections must be conducted:
1. Visual and Insulation Inspection
- Check that the switch housing (typically made of SMC composite material or ceramics) is free of cracks, damage, and that the transparent observation window (if equipped) is clean and unobstructed, allowing clear visibility of the internal contact status.
2. Status Indication and Locking Inspection
- Verify that the switch’s “ON/OFF” status indicator (or indicator light) is consistent with its actual position (contacts are closed when “ON” is indicated, and separated when “OFF” is indicated).
3. Load and Circuit Inspection
- Clarify the type of load controlled (e.g., motor, lighting circuit, distribution box) and confirm the load is in a normal operating state (no short circuits or severe overloads; an ammeter can be used to check if the current is within the rated range).
Principai technical parameter
- WordPress Table
Item Data Conventional thermal current (A) 63A 100A 160A 250A Rated current In (A) 40 63 80 100 125 160 200 250 Rated insulation voltage Ui (V) (installation type IV) Dielectric strength (V) Dielectric strength (V) 690 690 690 690 690 690 690 690 Dielectric strength (V) 5000 5000 5000 5000 5000 5000 5000 5000 Rated surge-resistant voltage Uimp kV (installed category IV) 6 6 6 6 6 6 6 6 Rated working current Ie (A) 380V AC-21B 40 63 80 80 125 160 200 250 AC-22B 40 63 80 80 125 160 200 250 AC-23B 40 50 80 80 125 160 200 250 660V AC-21B 40 50 80 80 125 160 200 250 AC-22B 32 32 50 50 125 160 160 160 AC-23B 25 25 40 40 80 80 100 125 Motor power P(kw) 380V 18.5 25 40 40 63 80 100 132 660V 22 22 33 33 75 75 90 110 Rated short - time withstand current Icw (kA Rms) 0.1s/1s 2 2 2 2 8 8 12 12 Rated breaking capability Icn (A Rms) AC23 380V 320 504 640 800 1000 1000 1600 1600 Rated making capability Icm (A Rms) AC23 380V 400 630 800 1000 1250 1600 2000 2500 Rated short - current making capability Icm (kA peak value) 2.84 2.84 2.84 2.84 13.6 13.6 17 17 Mechanical durability 380V 1700 1700 1700 1700 1400 1400 1400 1400 Electrical curability 380V 300 300 300 300 200 200 200 200 Operation moment (Nm) 1.2 1.2 1.2 1.2 6.5 6.5 10 10 - WordPress Table
Item Data Conventional thermal current (A) 630A Rated current In (A) 315 400 500 630 Rated insulation voltage Ui (V) (installation type IV) 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 Dielectric strength (V) 8000 8000 8000 8000 10000 10000 10000 10000 10000 10000 Rated surge - resistant voltage Uimp kV（installed category IV） 6 6 6 6 6 6 6 6 6 6 Rated working current Le(A) 380V AC-21B 315 400 500 630 1000 1250 1600 2000 2500 3150 AC-22B 315 400 500 630 1000 1250 1600 2000 2500 3150 AC-23B 315 400 500 630 660V AC-21B 315 400 400 500 1000 1000 1600 2000 2500 2500 AC-22B 315 315 315 315 800 800 800 1000 1250 1600 AC-23B Motor power P(kW) 380V 160 220 280 315 560 560 560 710 710 750 660V 185 185 185 185 475 475 475 750 710 750 Rated short - time withstand current Icw (kA Rms) 0.1s/1s 25 25 25 25 50 50 50 50 50 50 Rated breaking capability Icn (A Rms) AC23 380V 2520 3200 4000 5040 3000 3750 4800 6000 7500 9450 Rated making capability Icm (A Rms) AC23 380V 3150 4000 5000 6300 3000 3750 4800 6000 7500 9450 Rated short - current making capability Icm (kA peak value) 40 40 40 40 70 70 70 105 105 105 Mechanical durability 380V 800 800 800 800 500 500 500 300 300 300 Electrical durability 380V 200 200 200 200 100 100 100 100 100 60 Operation moment (Nm) 14.5 14.5 14.5 14.5 37 37 60 60 100 60
