SIRIUS Timing Relays - Time Delay for Control Circuits

Siemens SIRIUS timing relays provide precise time delays for control, starting and protection circuits. Compact 3RP20/25 for panels; slim versions for HVAC.

• 3RP25 multifunctional relays integrate up to 27 timing functions in compact industrial enclosures with industry-standard widths of 22.5 mm or 17.5 mm.
• 3RP20 contactor-design relays feature reduced height and mounting depth for tight clearances in switchboxes.
• 7PV15 narrow relays in 17.5 mm enclosures provide EMC-compliant performance for residential and standard applications.
• 3RP25 multifunctional relays are available for all conventional applications in an industry-standard width of 22.5 mm or space-saving 17.5 mm, with up to 27 integrated timing functions.
• 3RP20 compact relays are recommended where there is only minimal clearance between standard mounting rails or minimal mounting depth in switchboxes, due to their reduced height and mounting depth.
• 7PV15 narrow relays in 17.5 mm enclosure are suitable for all standard applications in control cabinets and distribution boards and comply with EMC requirements for residential applications.
• 3RA28 function modules are designed for assembly of starters and contactor assemblies for direct-on-line and star-delta starting.

SIRIUS timing relays deliver precision time-delayed switching for control, start-up, protection and regulation circuits across industrial applications. The portfolio includes 3RP25, 3RP20 and 7PV15 timing relays, plus 3RA28 function modules and auxiliary switches — each engineered for specific mounting and space requirements.

All models support wide voltage ranges from 12 to 240V AC/DC for global deployment flexibility.

Enjoy efficient use of control cabinet real estate with compact designs featuring industry-standard widths of 22.5 mm or 17.5 mm and reduced mounting depths while maintaining full timing and switching capabilities.

Support applications across various control cabinet and control system environments with up to 27 integrated timing functions in the 3RP25 series, providing comprehensive timing capabilities in a single relay.

Fit 3RA28 function modules directly onto 3RT2 contactors with key control functions for direct-on-line and star-delta starting included, featuring quick and easy mounting through simple snapping on and locking mechanisms.

Uniform 12 to 240V AC/DC voltage range across product lines accommodates diverse power systems worldwide, reducing the need for voltage-specific inventory and simplifying international deployments.

7PV15 timing relays feature changeover delay adjustable from 50 ms to 1 s, enabling optimum adaptation for star/delta motor starting sequences and providing precise control over transition timing.

3RA28 auxiliary switches include integrated varistors to attenuate contactor coil switching overvoltages, protecting control circuits and extending component lifespan in motor control applications.

SIRIUS timing relays are used for time-delayed switching in control, start-up, protection and regulation circuits. 3RP20/25 time relays are ideal timer components for control cabinet, switchgear and control systems. 7PV15 timing relays are ideal for use in heating, ventilation, air conditioning and compressors.

The choice depends on your mounting requirements and application environment.

Yes, the SIRIUS 7PV15 timing relays in 17.5mm enclosure are suitable for all standard applications and comply with EMC requirements for residential applications.

Solid-state time-delay 3RA28 auxiliary switches are designed for contactor coil voltages within the range of 24 to 240V AC/DC. They’re used for switching control and alarm signals in electronics applications, such as allowing run-on of a pump or fan, similar to an OFF-delay timing relay, or for delayed activation of a gate drive.

The SIRIUS 3RP25 timing relay simulator allows you to visualize the sequence of different timing functions and simulate a variety of fault cases. With this tool, you can verify timing behavior and troubleshoot potential issues in a virtual environment before deploying the relay in your control system.

Brochure| Fewer variants, more options with SIRIUS 3RP25