(Existing models at RPD-250V-0,4А, RPD-250V-1А, RPD-250В-2А и RPD-250V-5А)



High speed off with increased voltage in the network, as well as inhibition of high-energy pulse comparison allows you to securely protect against damage costs of devices as well as equipment in hard-available for repair.

Protection helps fight low quality power and frequent failure of equipment not adapted to the following problems:

-breakage of neutral wire;

-excess voltage;

– clatters contactors when turned on and turned off power lines;

-short-term or long-term supply line voltage;

-the origin of high-energy pulse obstacles in the process of switching from the side of the consumer and the supplier of electricity;

-passing along the line of lightning, and the formation of electromagnetic pulse.

Also do not allow the device to turn on in the case of:

-connect the equipment to the L-L instead of L-N (PE);

-connection to DC;

-the drawdown voltage.

Characteristics of the device of protection RPD-250-0.4A (as applied 0.4 A)

The characteristics of the




Operating voltage, 50 Hz

230 ±10%


Permissible amplitude voltage, V


Current consumer, A


Turn on under normal conditions, seconds



Emergency off, seconds


Automatic recovery, seconds



Protection of the consumer from high-energy pulses of 50 MS, kV/kA


Protection of the consumer from high-energy pulses 1 microsecond, kV



The power of its own consumption, W


The original impulse obstacle when an incoming pulse 1kV/500A, 8/20us, V


Guaranteed runtime failure, years


Number of normal inclusions, thsd times


Number of emergency situations, thsd times


Temperature operation, OC


+ 50

Storage temperature, оС


+ 80

Overall dimensions

52 x 42 x 150

On fig. 1 family of curves, which reflect the dependence of the output voltage from the input voltage, energy pulse obstacles of varying lengths.

Fig. 1 dependence of the input and output voltage for the module protection RPD-250-0.4A for example, when the input pulse 10kV cable length 20MS (red line) output pulse will be 630V in the time delay of the original signal are shown in Fig. 3

In Fig. 2 shows signal mains voltage with standard microsecond obstacle 4kV 20 MS. Disable conditional consumer occurs less than 10 MS. Disabling the need to lower the heat on the protective modules in the case of a prolonged transition process. Through 3-10 second after the last transition process occurs re-enabling.

Fig. 2 voltage incoming and outgoing Signals in the absence of the consumer. Left scale input voltage, and on the right side is the source.

Figure 3 displays the weenie with fig. 2 in scale, suitable for perception. From the picture you can see that the front of the front of the original signal are marked in blue, which practically coincide with the input signal red. In this case, the voltage at the end of the transition process a little higher than at the beginning, due to the natural characteristics of the elements used in the security module that displays product curves in Fig. 1.

Fig. 3 Microsecond pulse weenie. Signals input and output voltage.

On fig. 4 shows the reaction to the long drawn out obstacle 3kV 50 MS. Pulse the voltage on the consumer does not exceed the voltage according to Fig. 1, line 10 MS, at the moment of disconnection. It should be noted that most of the devices for industrial and domestic purposes are resistant to impulse comparison of the amplitude to 1 kV.

Fig. 4 the signals input and output voltage in the absence of the consumer. Left scale input voltage, and on the right side is the source.

Recommendations for the use of protection and protection devices RPD-250

The protection block of RPD-250 is designed to prevent failure of the consumer by limiting impulse network noise and then disconnecting the consumer in cases of reduced power quality.

The consumer is connected by an electromechanical relay Fig. 1 after evaluating the characteristics of the mains voltage and evaluating its suitability.

Disconnection occurs at increased mains voltage, contactors chatter, as well as impulse noise arising from lightning discharges and during transients in the network. After the normalization of the electrical network parameters, it is turned on again.

It is used to protect devices integrated in the network TN-C. Voltage limitation occurs between the “line” and “neutral” conductors; therefore, application in networks with a different type of grounding requires additional measures to limit impulse noise and increased voltage between the line-to-ground and neutral-to-ground conductors.

For long-term operation of RPD-250 and reliable consumer protection it is recommended:

– for the TN-C network (as shown in Fig. 2) install a fuse FU1 rated for the maximum allowable current RPD-250 at a rated voltage of the fuse 1kV or higher, also install a nonlinear voltage limiter R1 with an upper limit of 2kV;

– for the TN-S network (as shown in Fig. 2), install fuses FU1 and FU2 designed for the maximum allowed current of the RPD-250 at the rated voltage of the fuse 1kV. Also install non-linear voltage limiters R1 with an upper limit of 2kV, and R2 and R3 with an acceptable voltage for stable operation of the consumer under the influence of line-to-ground and neutral-to-ground, usually the upper limit of 1250V.

The protection device RPD-250 should be installed at a distance of no more than 100 meters from the consumer.

Figure. 1 Functional diagram.

Figure 2. Typical inclusion of the RPD-250 module in the low-voltage network.

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