Leakage circuit breaker is a common home furnishing one of the auxiliary materials, is the circuit leakage current exceeds a predetermined value of the switch can automatically act. Voltage type and current type two types are two common types of earth leakage circuit breaker, which current is divided into electromagnetic type and electronic type two. Leakage circuit breaker has the role of preventing personal electric shock. The following follow the Fuwu I came to a specific understanding of the leakage circuit breaker models and other related knowledge of the leakage circuit breaker!
First, the leakage circuit breaker model
5SM11110 residual current protection circuit breaker (125V ~ 230V) 16A2P10mAAC type 55mm
5SM11116 residual current protection circuit breaker (125V ~ 230V) 16A2P10mAAC type 55mm
5SM11116 residual current protection circuit breaker (125V ~ 230V) 16A2P10mAA type 55mm
5SM13116 Residual Current Protection Circuit Breaker(125V~230V) 16A2P30mAA Type 55mm
5SM13120 Residual Current Protection Circuit Breaker(125V~230V) 25A2P30mAAC Type 55mm
5SM13126 Residual Current Protection Circuit Breaker(125V~230V) 25A2P30mAAC type 55mm
5SM13140 Residual Current Protection Circuit Breaker(125V~230V) 40A2P30mAAC type 55mm
5SM13146 Residual Current Protection Circuit Breaker(125V~230V) 40A2P30mAAC type 55mm
5SM13160 Residual Current Protection Circuit Breaker(125V~230V) 63A2P30mAAC Type 55mm
5SM13166 Residual Current Protection Circuit Breaker(125V~230V) 63A2P30mAAC Type 55mm
5SM13170 Residual Current Protection Circuit Breaker(125V~230V) 80A2P30mAAC type 55mm
5SM13176 Residual Current Protection Circuit Breaker(125V~230V) 80A2P30mAAC type 55mm
5SM13420 Residual Current Protection Circuit Breaker(230V~400V) 25A4P30mAAC type 55mm
5SM13426 Residual Current Protection Circuit Breaker(230V~400V)25A4P30mAA Type 55mm
5SM13440 Residual Current Protection Circuit Breaker(230V~400V)40A4P30mAAC Type 55mm
5SM13446 Residual Current Protection Circuit Breaker(230V~400V) 40A4P30mAAC Type 55mm
5SM13460 Residual Current Protection Circuit Breaker(230V~400V)63A4P30mAAC Type 55mm
5SM13466 Residual Current Protection Circuit Breaker(230V~400V)63A4P30mAAC Type 55mm
5SM13470 Residual Current Protection Circuit Breaker(230V~400V)80A4P30mAAC Type 55mm
5SM13476 Residual Current Protection Circuit Breaker(230V~400V)80A4P30mAA Type 55mm
5SM13526 Residual Current Protection Circuit Breaker(500V) 25A4P30mAA type 55mm
5SM13546 Residual Current Protection Circuit Breaker(500V)40A4P30mAA type 55mm
5SM13566 Residual Current Protection Circuit Breaker(500V)63A4P30mAA type 55mm
5SM14120 Residual Current Protection Circuit Breaker( 125V~230V)25A2P100mAAC type 55mm
5SM14126Residual current protection circuit breaker(125V~230V)25A2P100mAAC type 55mm
5SM14140Residual current protection circuit breaker(125V~230V)40A2P100mAAC type 55mm
5SM14146 Residual Current Protection Circuit Breaker(125V~230V)40A2P100mAAC Type 55mm
5SM14160 Residual Current Protection Circuit Breaker(125V~230V)63A2P100mAAC Type 55mm
5SM14166 Residual Current Protection Circuit Breaker( 125V~230V)63A2P100mAAC type 55mm
5SM14170 Residual Current Protection Circuit Breaker (125V~230V)80A2P100mAAC type 55mm
Second, the leakage circuit breaker principle of operation
Leakage Circuit Breaker Composition and Working Principle of leakage circuit breaker has two functions, one is the With the function of circuit breaker, the second is with the function of leakage protection. Circuit breaker function is the same as the general low-voltage circuit breaker, as infrequent operation of the switching appliance. Leakage protection part of the detection of residual current through the zero sequence transformer, that is, by checking the side of the protected circuit within the phase line and the neutral line of the current instantaneous value, to determine the changes in the ground leakage current.
When the circuit leakage current exceeds the specified value or when someone is electrocuted, it can automatically cut off the power supply within a safe time, play a role in protecting electrical appliances to protect personal safety and prevent equipment leakage current caused by fire and other accidents. Leakage circuit breaker by the operating mechanism, electromagnetic detent, contact system, arc extinguishing chamber, zero sequence current transformer, leakage detent and test device and other components,
all components are placed in an insulated shell, modular miniature circuit breaker leakage protection function, is provided in the form of leakage accessory structure, when needed, can be combined with the circuit breaker.Leakage detector electromagnetic (ELM) and electronic (ELE) two kinds, the difference between them is that the former leakage current can be directly through the detector to operate the main switch, the latter leakage current to be amplified by the electronic amplifier line in order to make the detector action to operate the main switch.
Third, leakage circuit breaker selection principles
According to the purpose of use and electrical equipment where the place to choose.
(1) the protection of direct contact electrocution
Because of direct contact electrocution is more harmful, resulting in serious consequences, so we must choose a more sensitive leakage circuit breaker, power tools, mobile electrical equipment and temporary lines, should be installed in the circuit of the action current of 30mA, the action time of 0.1s leakage circuit breaker. For residential houses with more household appliances, it is best to install them behind the incoming energy meter.
If once electrocution is easy to cause secondary injuries (such as working at height), should be installed in the circuit with an action current of 15mA, the action time in the US within the leakage circuit breaker. For electrical medical equipment in hospitals,
an earth leakage circuit breaker with an action current of 6mA and an action time within US should be installed.(2) Indirect contact electrocution protection
Indirect contact electrocution in different places can cause different degrees of personal injury, so different places should be installed in different leakage circuit breakers. For easy electrocution hazardous places, require a higher sensitivity leakage circuit breaker. In the wet place than in the dry place of the danger of electrocution is much larger, generally should be installed for the action current of 15-30mA, action time within 0.1s of the leakage circuit breaker. For electrical equipment in the water, should be installed. Current 6-l0mA, action time within the US leakage circuit breaker. For the operator must stand on metal objects or metal containers in the electrical equipment, as long as the voltage is higher than 24V, should be installed with an action current of 15mA or less, action time within the US leakage circuit breaker. For fixed electrical equipment with voltage 220V or 380V, when the shell grounding resistance is below 500fZ, the single unit can be installed with an earth leakage circuit breaker with an operating current of 30mA and an operating time of 0.19. For rated current in 100A or more large electrical equipment or power supply circuit with multiple electrical equipment, can be installed with an action current of 50-100mA leakage circuit breaker, the grounding resistance of the electrical equipment in the following 1000, can be installed with an action current of 200-500mA leakage circuit breaker.
Fourth, according to the normal leakage current of the circuit and equipment to choose
1) single machine with leakage circuit breakers. Action current should be greater than 4 times the leakage current of the normal operation of the equipment.
2) leakage circuit breaker for branch lines, the action current should be greater than the normal operation of the line leakage current of 2.5 times, but also greater than the line leakage current in the largest leakage current of electrical equipment leakage current of 4 times.
3) backbone or network-wide total protection of the leakage circuit breaker, its action current should be greater than the normal operation of the grid leakage current 2.5 times.
If it is not easy to measure the leakage current of the line or electrical equipment, it can be estimated in accordance with the following empirical formula:
Lighting circuits or residential electricity circuits: leakage circuit breaker action current IDZ>ISJ/2000;
Mixed power and lighting circuit: leakage circuit breaker action current IDZ>ISJ/1000. 1000.
In the formula IDZ is the earth leakage circuit breaker action current, ISJ is the maximum current in the circuit.
1) Single-phase 220V power supply of electrical equipment should be selected two-pole two-wire type or single-pole two-wire type earth leakage circuit breaker.
2) three-phase three-wire 380V power supply of electrical equipment, should be used three-pole four-wire or four-pole four-wire earth leakage circuit breaker.
V. Leakage circuit breaker and leakage protector difference
Circuit breaker: circuit breaker is the control of the electrical circuit switch, if the air as the arc extinguishing medium called air circuit breaker (switch), if the sf6 gas as the arc extinguishing medium called sulfur hexafluoride circuit breaker (switch). Circuit breakers are generally selected by the rated current load, as the general switch of the electrical circuit.
(1), leakage protector and leakage protection switch:
Leakage protector and leakage protection switch: when an air switch with leakage protection, called leakage protection switch. If it is an electrical device for leakage protection alone, it is called leakage protector. Leakage protector, because it does not have a manual shut-off and closing mechanism.
The principle of determining whether the leakage is based on: leakage protector, which detects the power supply for the "inflow" and "outflow", because the current on the firewire is equivalent to the outflow point of the power supply, and the current in the zero line is equivalent to the power supply. Current "inflow" point, the line is normal without leakage, inflow and outflow of power current values equal in size and direction, but when the circuit has a leakage, then the zero line flow back to the power supply current should be less than the current value from the power supply into the power circuit, up to 30mA when the protector should be acted on, and cut off the zero and fire lines at the same time.
The current flowing into and out of the switch must be equal, otherwise it will be judged as leakage. When the leakage current reaches and exceeds a certain level, the protective action ---- tripped. The judgment threshold can be set, because the circuit is designed. It is just a matter of choosing protectors with different sensitivities for different applications. Residual current refers to the residual current action protection device through the main circuit (zero sequence transformer) of the current instantaneous value of the vector sum, expressed in terms of its rms value, for single-phase lines, the residual current is the phase leakage current to ground; for three-phase lines, the residual current is the current instantaneous value of the vector sum of the various phases, expressed in terms of its rms value.
Leakage circuit breaker is essentially installed to detect leakage components of the molded case circuit breaker, mainly by the plastic shell, operating mechanism, contact system, arc extinguishing chamber, the off-trigger, zero sequence current transformer and test device and so on.
My message: Although the leakage circuit breaker has a lot of benefits to our lives, and its role in preventing people from being electrocuted. But I still want to remind everyone. In daily life or pay more attention to safety, to know how to protect themselves oh.
Stand-alone can be installed with an operating current of 30mA, operating time within 0.19 leakage circuit breakers. For rated current in 100A or more large-scale electrical equipment or power supply circuit with more than one piece of electrical equipment, can be installed with an action current of 50-100mA leakage circuit breaker, the grounding resistance of the electrical equipment in the following 1000, can be installed with an action current of 200-500mA leakage circuit breaker.Fourth, according to the normal leakage current of the circuit and equipment to choose
1) single machine with earth leakage circuit breaker. Action current should be greater than 4 times the leakage current of the normal operation of the equipment.
2) leakage circuit breaker for branch lines, the action current should be greater than the normal operation of the line leakage current of 2.5 times, but also greater than the line leakage current in the largest leakage current of electrical equipment leakage current of 4 times.
3) backbone or network-wide total protection of the leakage circuit breaker, its action current should be greater than the normal operation of the grid leakage current 2.5 times.
If it is not easy to measure the leakage current of the line or electrical equipment, it can be estimated in accordance with the following empirical formula:
Lighting circuits or residential electricity circuits: leakage circuit breaker action current IDZ>ISJ/2000;
Mixed power and lighting circuit: leakage circuit breaker action current IDZ>ISJ/1000. 1000.
In the formula IDZ is the earth leakage circuit breaker action current, ISJ is the maximum current in the circuit.
1) Single-phase 220V power supply of electrical equipment should be selected two-pole two-wire type or single-pole two-wire type earth leakage circuit breaker.
2) three-phase three-wire 380V power supply of electrical equipment, should be used three-pole four-wire or four-pole four-wire earth leakage circuit breaker.
V. Leakage circuit breaker and leakage protector difference
Circuit breaker: circuit breaker is the control of the electrical circuit switch, if the air as the arc extinguishing medium called air circuit breaker (switch), if the sf6 gas as the arc extinguishing medium called sulfur hexafluoride circuit breaker (switch). Circuit breakers are generally selected by the rated current load, as the general switch of the electrical circuit.
(1), leakage protector and leakage protection switch:
Leakage protector and leakage protection switch: when an air switch with leakage protection, called leakage protection switch. If it is an electrical device for leakage protection alone, it is called leakage protector. Leakage protector, because it does not have a manual shut-off and closing mechanism.
The principle of determining whether the leakage is based on: leakage protector, which detects the power supply for the "inflow" and "outflow", because the current on the firewire is equivalent to the outflow point of the power supply, and the current in the zero line is equivalent to the power supply. Current "inflow" point, the line is normal without leakage, inflow and outflow of power current values equal in size and direction, but when the circuit has a leakage, then the zero line flow back to the power supply current should be less than the current value from the power supply into the power circuit, up to 30mA when the protector should be acted on, and cut off the zero and fire lines at the same time.
The current flowing into and out of the switch must be equal, otherwise it will be judged as leakage. When the leakage current reaches and exceeds a certain level, the protective action ---- tripped. The judgment threshold can be set, because the circuit is designed. It is just a matter of choosing protectors with different sensitivities for different applications. Residual current refers to the residual current action protection device through the main circuit (zero sequence transformer) of the current instantaneous value of the vector sum, expressed in terms of its rms value, for single-phase lines, the residual current is the phase leakage current to ground; for three-phase lines, the residual current is the current instantaneous value of the vector sum of the various phases, expressed in terms of its rms value.
Leakage circuit breaker is essentially installed to detect leakage components of the molded case circuit breaker, mainly by the plastic shell, operating mechanism, contact system, arc extinguishing chamber, release, zero sequence current transformer and test device and so on.
My message: Although the leakage circuit breaker has a lot of benefits to our lives, and its role in preventing people from being electrocuted. But I still want to remind everyone. In our daily lives, we should pay more attention to safety, and we should know how to protect ourselves.