PILZ PST 720300

Pilz PST 4 Safety Relay

Description

The Pilz PST 4 is a robust safety relay designed for monitoring critical safety functions in industrial applications. This unit, with part number 720300, is ideal for implementing safety circuits for E-STOP pushbuttons, safety gates, and other safety devices. Operating on a 24VDC supply, it provides a reliable solution for maintaining older machinery or as a spare part, ensuring your systems comply with required safety standards.

Specifications

• Manufacturer: Pilz
• Model: PST 4
• Part Number: 720300
• Supply Voltage: 24VDC, 5.5W
• Contact Configuration: 6 NO (Normally Open) safety contacts, 4 NC (Normally Closed) auxiliary contacts
• Output Rating (AC15): 230V 5A
• Output Rating (DC13): 24V 7A
• Mounting: DIN Rail

Label Info

• Ident.Nr: 720300
• Type: PST 4 6S/4O
• Standard: DIN VDE 0110 4kV/3

Application

This safety relay is commonly used in manufacturing, packaging, and processing industries to ensure the safe operation of machinery. It is suitable for single or dual-channel safety applications.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned unit, you are helping to avoid the production of a new one, which saves approximately 12.0 kg of CO2. This is a sustainable choice for your business and the environment.

Availability

This is an obsolete item, but it is available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the difference between the PST 4 and a modern PNOZ X3 relay?

The PST 4 is an older generation safety relay. While both monitor safety functions, the PNOZ X3 offers enhanced diagnostics via LEDs, is more compact, and meets newer safety standards. However, the PST 4 is a direct replacement for existing systems without needing rewiring or reprogramming.

Can I use this PST 4 relay for a two-hand control application?

The Pilz PST 4 is primarily designed for E-STOP and safety gate monitoring. For two-hand control applications, you should use a dedicated two-hand control relay, such as a Pilz P2HZ model, which meets the specific requirements of EN 574/ISO 13851.

What do the “6S/4O” markings in the full type number mean?

This is a German abbreviation for the contact configuration. “6S” stands for 6 “Schliesser” (Normally Open safety contacts), and “4O” stands for 4 “Oeffner” (Normally Closed auxiliary contacts). This corresponds to 6 NO / 4 NC in English terminology.

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Last Update: Friday, March 13, 2026