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Comparison ADECS ADC-0110-40 vs DigiTOP VA-protector VA-40A

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ADECS ADC-0110-40
DigiTOP VA-protector VA-40A
ADECS ADC-0110-40DigiTOP VA-protector VA-40A
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Devicemultifunctional relaymultifunctional relay
Voltagevariablevariable
Number of phases11
MountdIN raildIN rail
Width (unit)3 U3 U
Specs
Power8.8 kVA8.8 kVA
Rated current40 А40 А
Maximum current50 А50 А
Voltage measuring range120 – 400 V50 – 400 V
Measurement accuracy (±)1 %1 %
Cut-off time (lower limit)0.02 с0.06 с
Off time (upper limit)0.02 с0.04 с
Reclosing delay10 – 990 с5 – 600 с
Lower cut-off limit150 – 195 V120 – 200 V
Upper cut-off limit245 – 270 V210 – 270 V
Current trip limit25, 32, 40 А40 А
Functions
display
thermal protection
fault memory
display
 
 
General
Adjustmentdigitaldigital
Protection levelIP20IP20
Dimensions53x95x66 mm
Weight155 g
Added to E-Catalogdecember 2017december 2017

Voltage measuring range

Voltage measurement range supported by the device.

Many modern control relays are equipped with digital displays, which can display, including current voltage; this parameter specifies the operating range of the built-in voltmeter. In this case, the voltage measurement range can be noticeably wider than the difference between the smallest minimum and the largest maximum shutdown threshold (see below). This allows you to use the relay also for online diagnostics of the network status.

For a current relay (see "Device") in this case, the range of operating voltages can be given directly — the voltage at which the device can normally perform its functions.

Cut-off time (lower limit)

Time to turn off the device on the lower limit of voltage or current. This is a kind of "reaction time" of the relay: the period of time between reaching the lower limit and turning off the protected network segment.

The lower this value, the more advanced the protection will be, the lower the probability of failure of sensitive devices due to untimely operation of the relay. On the other hand, a high response rate for the lower limit is not as critical as for the upper one, and the shutdown time can be quite long — 1 s or more.

Also note that for some devices, this paragraph gives the minimum turn-off time (fastest response time), while in certain modes this time may be longer. For example, a voltage relay with a lower limit of 160 V may provide tripping after less than 0.05 s when the voltage drops below 120 V and tripping after 1 s when the voltage is in the range of 120 – 160 V, but above 120 V. This avoids unnecessary shutdowns with relatively weak and short-term voltage deviations. In the characteristics of such a device, 0.05 s will be indicated.

Off time (upper limit)

The device shutdown time on the upper limit of voltage or current. This is a kind of "reaction time" of the relay: the period of time between reaching the upper limit and turning off the protected network segment.

The lower this value, the more advanced the protection will be, the lower the probability of failure of sensitive devices due to untimely operation of the relay. Note that a short reaction time in this case is especially important, because too high a voltage or current is a serious danger to any device.

Reclosing delay

The reclosing delay is the time after a safety shutdown after which the device turns on the mains power again. Usually, in modern control relays this time can be adjusted, so the characteristics indicate the range from the minimum to the maximum value.

Adjustment of the delay allows you to adjust the format of the relay to the characteristics of the network. So, if voltage failures do not mean critical problems, you can set the minimum re-closing time, and if jumps occur only with serious problems that need to be fixed, it is better to turn on the maximum delay. Note that triggered relays usually allow manual reclosing, and in most models it is possible to completely disable the automatic reclosing function.

Lower cut-off limit

The lower voltage shutdown limit provided in the relay; when the voltage drops below this value, the device turns off the power to the protected network segment. Usually, this limit can be adjusted, and the specifications indicate the range of such adjustment.

Although the main danger for various electrical appliances is increased voltage, many devices do not tolerate too low voltage. Therefore, modern voltage relays provide shutdown not only on the upper, but also on the lower threshold.

Upper cut-off limit

The upper voltage shutdown limit provided in the relay is the voltage, when exceeded, the device turns off the power to the protected network segment. Usually, this limit can be adjusted, and the specifications indicate the range of such adjustment.

Current trip limit

The upper current shutdown limit provided in the device is the threshold above which the relay switches off the protected network segment. Many models allow you to adjust this limit; for them, the range of such adjustment is indicated in the characteristics. Note that for the upper limit of this range, some manufacturers take not the maximum, but the rated current of the device; see above for details on these options.

Functions

Display. As a rule, control relays are equipped with simple segment LCD displays that can display numbers and some special characters. This screen performs two main functions. Firstly, during operation it displays key network parameters - voltage, power and/or power, as well as notifications of problems; Some models provide several separate displays, each with its own parameter. Secondly, the screen is used when changing device settings.

Operation indicator. A pointer indicating the operation of a device, and often a specific mode of operation. Note that in this case we are talking about the simplest indicators - for example, in the form of an LED, which lights up green in normal mode and lights up red after the protection is triggered. The display is not considered an operation indicator, although it can perform such a function.

Thermal protection. A safety system that turns off the device when it reaches a critical temperature. Some models also provide a shutdown when the permissible heating rate is exceeded. This function serves as additional insurance in case of malfunctions in the relay itself (for example, if the settings are lost and the device does not respond to overload), and in case of fire (in case of fire, the equipment must be de-energized).

Memory of emergency operations. The function...of saving data on the state of the network during emergencies. Allows you to assess the situation of what happened after resuming work.
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