Automation

Switchgear

Safety Technology

Commanding and Signalling

Control, Display and Operate

Timing relays

Safety relays

Measuring and monitoring relays

Current Monitor

Phase Sequence Relay

Phase Monitor

Unbalance Relay

Level Relay

Earth-leakage Monitor

Three-phase Monitor

Rotary switches, switch disconnectors

Small Enclosures CI-K

Easy control relays

easyControl compact control

easyHMI: MFD-Titan

easyHMI: MFD4

Switching and Protecting Motors

Switching and Protecting High Power

Darwin Technology

Insulated Distribution Boards

EMR4-W Phase Monitor – Destruction/Damage Protection for Individual System Sections

EMR4-W phase monitors are used for monitoring the phase sequence and the applied voltage level, thus offering protection against destruction or damage to individual system sections. A dial allows easy setting of the required voltage for both the minimum undervoltage and maximum overvoltage within a defined window.

Both on-delayed and off-delayed functions are possible. The on-delayed setting enables short overvoltages or voltage dips to be bridged. The off-delay setting allows faults to be stored for the time set.

The delay time can be set between 0.1 s and 10 s. The relay picks up if the phase sequence and the voltage are correct. After it has dropped out, the device does not pick up again until the voltage goes over a 5 % hysteresis.

Features

• Phase sequence detection
• Phase loss detection at U < 0.6 x Ue
• LED status indication
• The relay features a second changeover contact that is used for indication purposes
• 2 versions for monitoring voltage U = 300-500 V AC and 350-580 V AC
• Either on or off-delay (0.1 s – 10 s).