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 models for control panels; slim versions for HVAC systems.

• 3RP25 multifunctional relays integrate up to 27 timing functions into compact industrial enclosures with industry-standard widths of 22.5 mm or 17.5 mm.
• 3RP20 contactor-design relays feature a 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 a space-saving 17.5 mm, with up to 27 integrated timing functions.
• 3RP20 compact relays are recommended when 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 a 17.5 mm enclosure are suitable for all standard applications in control cabinets and distribution panels and comply with EMC requirements for residential applications.
• 3RA28 function modules are designed for the assembly of starters and contactor assemblies for direct-on-line and star-delta starting.

SIRIUS timing relays provide precise time-delayed switching for control, startup, protection, and regulation circuits in a wide range of industrial applications. The product portfolio includes 3RP25, 3RP20, and 7PV15 timing relays, as well as 3RA28 function modules and auxiliary switches—each engineered to meet specific mounting and space requirements.

All models support a wide voltage range from 12 to 240 V AC/DC, providing flexibility for global deployment.

Make efficient use of control cabinet space 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.

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

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

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

7PV15 timing relays feature a changeover delay that can be adjusted from 50 ms to 1 s, enabling optimal 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 cabinets, switchgear, and control systems. 7PV15 timing relays are ideal for use in heating, ventilation, air conditioning, and compressor systems.

The choice depends on your mounting requirements and application environment.

Yes, the SIRIUS 7PV15 timing relays in a 17.5-mm 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 ranging from 24 to 240 V AC/DC. They are used to switch control and alarm signals in electronic applications, such as allowing a pump or fan to run out, similar to an OFF-delay timing relay, or for the 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 scenarios. 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