Time relay with alternating operation zero-cross switching 230V AC PCM-33 EXT10000307

Time relay for alternating cyclic operation

The PCM-33 time relay is a device designed for cyclic switching of loads on and off, particularly useful in applications requiring regular switching, such as controlling pumps or lighting. A key feature of this model is the zero-voltage and zero-current switching technology (ZVS and ZCS), which minimizes interference and extends the life of the device and connected receivers.

Application and functionality

The PCM-33 relay is widely used in building automation, lighting control systems, and industrial applications. Its main task is to perform an alternating operation function – starting a load for a specified time, then turning it off and repeating the cycle. This allows for efficient energy management and optimization of device operation. It works particularly well with single-phase pumps, where it ensures their smooth starting and stopping.

ZVS/ZCS switching technology – what does it give?

The use of zero-voltage (ZVS) and zero-current (ZCS) switching technology is a significant advantage of this relay. This means that the switching on and off of the load occurs at the moment when the voltage and current in the circuit are zero. This solution brings a number of benefits:

• Reduction of interference: Minimizes the occurrence of overvoltages and electromagnetic interference (EMC), which affects the stability of the entire system.
• Extended service life: Reduces wear on the relay contacts, which translates into longer operation.
• Safety: Reduces the risk of damage to connected devices, especially those sensitive to sudden voltage changes.
• LED compatibility: Allows controlling high-power LED loads without the risk of damage or malfunction.

Mounting and connection

Mounting the PCM-33 relay is simple and intuitive. The device is designed for mounting on a TH35 (DIN) rail, which facilitates its integration with existing electrical panels. Connection of the wires is done using six connection terminals, and the wire cross-section should be from 0.2 to 2.5 mm². Before starting work, remember to disconnect the power supply and check for voltage on the wires! Installation should be performed by a qualified electrician with SEP 1kV qualifications.

Technical data (summary):

• Rated voltage: 230V AC
• Power consumption: 1.5W
• Contact load capacity: 16A
• Operating mode: Alternating
• Time setting range: 0.1s ÷ 10 days
• Protection class: IP20
• Operating temperature: -20°C ÷ +60°C
• Compliance with standards: PN-EN 60715; PN-EN 60529; PN-EN 61000-4-5