Phase failure, asymmetry and phase sequence relay PZAK-1 002471409

Relay for electrical installation protection – reliability and safety

The phase failure, asymmetry and sequence relay PZAK-1 is a device designed for comprehensive protection of electrical installations against various power supply disturbances. It provides effective detection of voltage failure, phase asymmetry and incorrect phase sequence, minimizing the risk of equipment damage and ensuring uninterrupted power supply. It is a key element in systems requiring high reliability, such as commercial, industrial buildings or single-family homes with sensitive equipment.

Functionality and application

The device monitors three-phase power supply in the voltage range of 175…400 V, reacting to irregularities in voltage and phase sequence. Thanks to the undervoltage control function, PZAK-1 protects devices from operating in low voltage conditions, which extends their lifespan. The use of clamp terminals facilitates quick and reliable installation in control cabinets. The relay has one normally closed contact and one normally open contact, allowing for flexible adaptation to various control and signaling schemes. Adjustable time delay (1-3.5 s) in case of power failure avoids false alarms caused by short-term voltage drops.

Construction features and benefits

• Versatile protection: One device provides protection against voltage failure, phase asymmetry and incorrect phase sequence.
• Precise measurement: Wide voltage measurement range (175…400 V) allows use in various electrical networks.
• Adjustable time delay: Allows adaptation of the relay's operation to specific installation operating conditions.
• Compact dimensions: Height 90 mm, width 18 mm and depth 65 mm facilitate installation even in limited space.
• Solid connections: Clamp terminals ensure safe and durable connection of wires.
• Status indication: Has normally closed and normally open contacts to indicate the operating status of the relay and to activate appropriate emergency procedures.
• Phase failure detection: Additional function increasing installation safety by detecting the absence of one of the supply phases.