Schneider household miniature circuit breaker Resi9 series selection and principle

Schneider miniature circuit breaker Resi9 series features

To ensure the safety of personnel and equipment in harsh environments, it can be said that the Resi9 series of Schneider miniature circuit breakers are a good choice for switching and protection in household electricity scenarios. It can ensure good safety in the maintenance process. The switch on the front of the circuit breaker has the VisiSafe "visible safety" sign. In any environment and condition, the role of VisiSafe is to ensure the safety and reliability of the lower-level circuit , The specific description is shown in the figure below.

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●VisiSafe green indicator bar can clearly and reliably indicate the contact disconnection position.

●Impact withstand voltage: Uimp=4kV.

○Ensure that even in the case of overvoltage, the service life of the equipment is still effectively improved.

●The highest pollution resistance level among modular equipment: Class 3.

○A real miniature circuit breaker suitable for harsh environments, even those with dust or conductive pollution.

●Insulation voltage: 500V.

○It can play a role in ensuring the safety of operators.

◆Absolute protection against electric shock.

The electric shock protection class of Schneider miniature circuit breakers is Class 2 (Class 2), and the Resi 9 series are devices with a higher safety level so far. The electrical clearance between the surface of the circuit breaker case and the internal parts is higher than twice the standard requirement. Regardless of the environment or the experience of the operator, the Resi9 series of household miniature circuit breakers can guarantee risk-free maintenance and use during the entire life cycle of the equipment.

◆Protect the load and effectively extend the service life.

The full range of Schneider Resi9 can achieve a fast closing function, and at the same time it can perfectly limit the energy release when the contacts are closed, which helps prevent the equipment from overheating and aging.

◆Reliable fastening.

The tightening torque that Schneider circuit breaker Resi9 terminal can bear is equivalent to twice the national standard torque, making the cable connection more reliable and firmer.

◆Safe and reliable connection.

The protection level of the terminal block of the miniature circuit breaker has reached IP20B, which makes the connection and protection of the entire family circuit more reliable and safer.

Schneider miniature circuit breaker Resi9 series selection

◆The model meaning and naming rules of circuit breakers are shown in the figure below.

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Note: This series of models includes 4 different types of equipment, namely miniature circuit breakers, "phase + neutral" miniature circuit breakers, leakage protection circuit breakers, and self-resetting over-voltage and under-voltage protectors.

Schneider miniature circuit breaker Resi9 series parameters

◆Technical parameters of miniature circuit breakers (three types).

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◆Resi9 miniature circuit breaker (C, D tripping curve characteristics) selection parameter table.

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Note: The features are as follows.

●Short circuit protection;

●Overload protection;

●Isolation function;

●Clear instructions for contact disconnection;

●Three-level current limit;

●Quick closing;

●Use optional electrical accessories to realize remote indication of circuit breaker status: including breaking, closing, fault trip, etc.;

● "Top in, bottom out" or "bottom in, top out" wiring mode.

◆Resi9 high rated current miniature circuit breaker (C, D trip curve characteristics) selection parameter table.

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Note: This equipment is suitable for places with high electrical load and can achieve the following functions and functions.

●High current load protection and control;

●Overload or short circuit protection of distribution lines;

●Manual control and breaking;

●Used with residual current action protection accessory (Vigi C120), there is no derating phenomenon.

◆Resi9 "phase + neutral" miniature circuit breaker (C tripping curve characteristic) selection parameter table.

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Note: "Phase + Neutral" Schneider Miniature Circuit Breaker is used for overload and short circuit protection and control of the terminal line. It can cut off the phase line and the neutral line at the same time, but the neutral line does not provide protection.

Schneider miniature circuit breaker Resi9 series tripping curve

Type C and Type D tripping curves of miniature circuit breakers with a rated current of 6 to 63A conform to the IEC60898-1 standard. The instantaneous magnetic tripping action range is Type C curve (5-10) In and Type D curve (10-14) In, the specific characteristics are shown in the figure below.

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The C-type and D-type tripping curves of high-rated current miniature circuit breakers conform to the IEC 60898 standard, and their instantaneous magnetic tripping action ranges are C-type curve (5-10) In and D-type curve (10-14) In. Specific characteristics As shown below.

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Schneider miniature circuit breaker Resi9 series current limiting principle

The protection function of miniature circuit breakers is to prevent electrical conductors and electrical equipment from being damaged by thermal stress and dynamic stress. According to Joule's law, the energy integral formula through the circuit breaker is shown in the following figure:

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It can be seen from the formula that the energy passing through the device depends on the current and time it passes. The faster the breaking time of the circuit breaker, the smaller the energy passing through the body. At the same time, the faster its action time means the smaller the breaking current and the energy Will be further reduced.

Why the faster the breaking speed of the circuit breaker, the smaller the breaking current?

We know that the rated current of the circuit breaker is small during normal operation, and the expected maximum short-circuit current effective value of the short-circuit point when a short circuit occurs is several thousand amperes or more than ten thousand amperes, but in fact, the short-circuit current is always from the normal operation The current continuously rises to the short-circuit current value, and this process always takes a certain amount of time, and the small circuit breaker has a fast action speed and will open the circuit breaker before the current rises to the maximum value. Therefore, the faster the device reacts, the smaller the breaking current, the lower the energy passing through the miniature circuit breaker, and the better the current limiting capability.

●Current limit level.

○First-level current limit: I2t is allowed to be a sine full half-wave energy;

○Secondary current limit: I2t is allowed to be 1/3 of the energy of a sine full half wave;

○Three-level current limit: I2t is allowed to be 1/10 of the energy of a sine full half wave.

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