PTE208-MD0EST 3 fases D RST+n 208 – Digital Three-Phase Electronic Voltage Protector 208 VAC

The BREAKERMATIC 3 fases D RST+N is an electronic voltage protector that monitors line and phase voltages in the power supply for a three-phase appliance, protecting it against voltage fluctuations, imbalances, and neutral losses. It also prevents the machine from starting when the direction of rotation dictated by the phases has been reversed or when a phase is missing. It will also disconnect if there is a variation in the line frequency.

The BREAKERMATIC 3 fases D RST+N can operate in two modes: 3-wire mode and 4-wire mode. In 3-wire mode, it measures only line voltages and verifies that the imbalance between them is lower than the selected voltage. In 4-wire mode, with the neutral connected, you can protect unbalanced loads, as the protector measures the phase voltages, ensuring they are within the selected voltage range.

The BREAKERMATIC 3 fases D RST+N has front adjustment knobs that allow you to select the high and low cutoff voltages. You can also adjust the reconnection delay after a voltage failure. The fourth knob allows you to select the maximum phase imbalance and choose whether to operate in 3- or 4-wire mode. The knobs are protected by a transparent cover that can be sealed to prevent accidental manipulation of the settings.

The BREAKERMATIC 3 fases D RST+N output consists of a de-energized relay, which can control an external contactor or any stop signal that allows the machine to stop.

The disconnection operation is automatic when a fault is detected. Reset after the fault disappears can be manual or automatic. With manual reset, you can control the start-up of sensitive equipment and determine the cause of the shutdown.

The protector displays faults and output status using four multicolor indicator LEDs clearly identified on the front label.

It can be mounted using an omega rail (DIN rail) for electrical panels, or directly to a wall using screws placed through built-in fixing brackets.

Ideal for

• Hydro pneumatic pumps
• Elevators and three-phase motors
• Refrigeration, ventilation, and air conditioning equipment
• Industrial transport.
• Lighting systems
• Electrical panels

Operation

Protection against steady-state voltage variations

The BREAKERMATIC 3 Phase D RST+N Omega Rail disconnects the output if the steady-state voltage is above the voltage set on the "high voltage" knob or below the voltage set on the "low voltage" knob. The response time is 1 second. The voltage must remain outside the range longer than the response time for the disconnection to be activated. While the fault persists, the corresponding indicator will remain lit.

Operating modes.

The protector can operate in 3-wire mode, measuring only phase-to-phase voltages, or in 4-wire mode, also measuring phase-to-neutral voltages.

Unbalance

In 3-wire mode, phase imbalance protection can be configured, allowing you to set a maximum phase imbalance range. If the phase imbalance exceeds the preset limit, the protector will disconnect the output. The response time to phase imbalance faults is 1 second.

Neutral monitoring and phase to neutral measurements

In 4-wire mode, it is assumed that the load is inherently unbalanced and that we want to protect loads between phase and neutral. The protector disconnects the output if the neutral is not connected, indicating a neutral fault. It includes an additional label with the phase voltage values to facilitate setting the cutoff voltages in this mode.

Reconnection delay or wait cycle.

When the protector is energized, or at the end of a voltage fault, the protector will initiate a time delay before connecting the output. The duration of the time delay can be adjusted using the "wait cycle" knob between 5 s and 300 s (5 min). The wait cycle protects sensitive equipment from short operating cycles.

Manual or Automatic reset

This can be configured so that at the end of the standby cycle, the protector automatically reconnects the output or waits for a manual rearm. If manual rearm is selected, the cause of the trip will be indicated by flashing the corresponding indicator.

Blackout and brownout detection.

The protector will disconnect the load if it detects a sudden voltage drop below 50% of the nominal voltage and initiate a standby cycle. The response time of the blackout detector is instantaneous; the minimum blackout duration is specified in the specifications, but it is guaranteed to be greater than the maximum transfer time on the distribution lines. Therefore, this maneuver does not affect the protector and does not disconnect the load.

Absence of a phase.

The protector will disconnect the output and indicate a phase absence when the voltage on one of the phases is missing. The protector could detect the voltage generated by the electromotive force of a rotating motor as a phase present, in which case it would signal low voltage or phase imbalance.

Reversal of the direction of rotation or phase sequence.

If the phase sequence is reversed, the protector will immediately disconnect the output. The response time to this disturbance is less than one line cycle.

Frequency

The BREAKERMATIC 3 Phase D RST+N Omega Rail operates at a single frequency value. If the frequency deviates from this value, it disconnects the output.