Residual Current Device
LZAB1L-63 C20 miniature residual current circuit breaker
Applicable Scope
The LZAB1L series small residual current circuit breaker (hereinafter referred to as residual current circuit breaker) is mainly suitable for use as residual current protection in AC 50Hz rated working voltage 230V1400V, rated current up to 100A lines. When someone is electrocuted or the leakage current of the circuit exceeds the specified value, the residual current circuit breaker can automatically cut off the power supply in a very short time, ensuring personal safety and preventing equipment accidents caused by leakage current.
Leakage circuit breakers have overload and short circuit protection functions, which can be used to protect the circuit from overload and short circuit, and can also be used for infrequent switching of the circuit under normal circumstances.
This product complies with GBIT 16917.1 and GB/T16917.22 standards.
Working Conditions
1. The upper limit of the surrounding air temperature shall not exceed+40 ℃, the lower limit shall not be lower than -5 ℃, and the average temperature value over 24 hours shall not exceed+35 ℃
2. The altitude of the installation site shall not exceed 2000m;
3. The relative humidity of the atmosphere should not exceed 50% when the ambient air temperature is+409 ℃. Higher relative humidity is allowed at lower temperatures, and the monthly average minimum temperature of the wettest month should not exceed+25 ℃. The monthly average maximum relative humidity of that month should not exceed 90%, taking into account condensation on the surface of the product due to temperature changes;
4. Pollution level: Level 2;
5. Installation category: Class II and Class III;
6. The external magnetic field of the installation site should not exceed 5 times the geomagnetic field in any direction.
Structural Working Principle
2. Working principle
When the closing handle of the residual current circuit breaker is turned to the ON position, the mechanism drives the moving contact to make reliable contact with the stationary contact, connecting the circuit. When an overload fault occurs in the circuit, the overload current causes the thermal bimetallic element to bend and push the lock buckle to reset the mechanical locking mechanism. The moving contact quickly leaves the stationary contact, thereby achieving the function of breaking the circuit; When a short circuit fault occurs in the circuit, the short-circuit current causes the instantaneous release device to actuate, and the iron core top rod to actuate, resetting the locking mechanism and achieving the breaking function; When there is a leakage or electric shock fault in the circuit, the signal output by the zero sequence transformer triggers the thyristor to conduct, and the iron core of the leakage circuit breaker acts. The push rod pushes the circuit breaker to trip, causing the leakage circuit breaker to cut off the current within 0.1 seconds, thus achieving the leakage protection function.
Main Technical Indicators
| Model | Rated current A | Number of poles | Rated voltage V | Breaking ability A | Mechanical lifespan | Electrical lifespan |
| LZAB1L-63 (LZAB1L-63H) | 1、3、6、10 | 1N、2 | 230/400 | 4000 6000(63H) |
2000times | 2000times Cosφ=0.7 |
| 16、20、25、32 | ||||||
| 40、50、63 | 2、3、3N、4 | 400 | ||||
| LZAB1L-125 | 63、80、100、125 | 1N、2 | 230/400 | 10000 | ||
| 2、3、3N、4 | 400 |
2. Rated residual connection and disconnection capacity I △ m: 2000A;
3. Rated residual operating current I △ n: 30mA (LZAB1L-63/63H), 50mA (LZAB1L-125);
4. Rated residual non operating current I △ no=0.51 △ n;
5. The time for residual current action to disconnect is shown in the table below;
| In(A) | I△n(mA) | Maximum residual current interruption time (s) | |||
| I△n | 2I△n | 5I△n | 250mA | ||
| 6~125 | ≤30 | 0.1 | - | - | 0.04 |
| >30 | 0.2 | 0.1 | 0.04 | - | |
6. Insulation impulse voltage resistance performance:
a) The poles connected together and the neutral pole can withstand a peak impulse voltage of 6KV;
b) The nominal pole and neutral pole connected together and the metal bracket can withstand a peak impulse voltage of 8kV.
7. The residual current circuit breaker has the ability to withstand surge currents of 200A and surge voltages of 2.5V2Un without causing misoperation;
8. The overcurrent protection characteristics are shown in the table below.
| Number | Rated current In | Starting State | Test current | Schedule | Expected Results | Remark |
| a | LZAB1L-63(63H) | Cold | 1.13In | t≥1h | No tripping | |
| LZAB1L-125 | 1.05In | t≥2h | ||||
| b | LZAB1L-63(63H) | Immediately after test A | 1.45In | t<1h | Tripping | The current rises steadily to the specified value within 5s |
| LZAB1L-125 | 1.30In | t<2h | ||||
| C | In≤32A | Cold | 2.55ln | 1s<t<60s | Tripping | |
| In>32A | 1s<t<120s | |||||
| d | All values | Cold | 5In | t≤0.1s | No tripping | Type C |
| 10In | Type D | |||||
| e | All values | Cold | 5In | t<0.1s | Tripping | Type C |
| 10In | Type D |
Installation Dimensions
| Model Specifications | In≤32A(3、6、10、16、20、25、32) | In>32A(40、50、63) | ||
| L(mm) | H(mm) | L(mm) | H(mm) | |
| LZAB1L-63(H)/1N | 45±1.0 | 71.5±1.0 | 54±1.25 | 71.5±1.0 |
| LZAB1L-63(H)/2 | 63±1.0 | 74.5±1.0 | 72±1.5 | 74.5±1.0 |
| LZAB1L-63(H)3 | 90±1.75 | 74.5±1.0 | 103.5±1.75 | 74.5±1.0 |
| LZAB1L-63(H)/3N | 99±1.75 | 74.5±1.0 | 117±1.75 | 74.5±1.0 |
| LZAB1L-63(H)/4 | 117±1.75 | 74.5±1.0 | 135±1.75 | 74.5±1.0 |
