Overview
The Siemens 3RP1505-1BQ30 is a compact, solid-state multifunction time delay relay engineered for precision timing control in industrial automation and control panel applications. This relay is designed for precise timing control in industrial automation systems and operates on a wide control voltage range of 24–240V AC/DC, providing reliable time-delay switching with adjustable timing functions. It features 2 changeover contacts, 16 functions, and 15 time ranges from 0.05 seconds to 100 hours, operates at 24V, 100–127V AC and 24V DC at 50/60 Hz AC with LED and screw terminal. This unit is ideal for original equipment manufacturers (OEMs), system integrators, and maintenance technicians requiring dependable timing logic in motor control circuits, automation sequences, and industrial control systems.
Key Features
- 16 Selectable Functions: On-delay, off-delay, on/off-delay, flashing, pulse contact, and additive timing modes for flexible control logic.
- 2 Changeover (CO) Contacts: DPDT relay configuration with 1 normally open and 1 normally closed contact for flexible circuit integration.
- Wide Voltage Range: Operates on 24–240V AC/DC supply, accommodating most industrial power systems without re-specification.
- Adjustable Timing: Adjustable time from 0.05 seconds to 100 hours, covering microsecond to hour-scale delays in a single unit.
- Plug-In Design: Integrates easily using a plug-in mounting style, simplifying installation and replacement in existing control panels.
- LED Indicator: Visual feedback for timing status and relay operation verification on-site.
Technical Specifications
| Part Number | 3RP1505-1BQ30 |
| Manufacturer | Siemens |
| Product Type | Multifunction Time Delay Relay |
| Contact Configuration | 2 Changeover (DPDT) |
| Control Voltage | 24 V DC, 100–127 V AC, 50/60 Hz AC |
| Timing Functions | 16 selectable modes |
| Time Range | 15 ranges: 0.05 s to 100 h |
| Switching Contact Rating | 3 A @ 24 V, 115 V, 230 V |
| Terminal Type | Screw terminal |
| Mounting Style | Plug-in / DIN track |
| Enclosure | Plastic DIN case |
| Weight | Approximately 150 g (5.29 oz) |
| Condition | New in Box |
Typical Applications
The relay is typically used in control logic sequences, motor control circuits, and automation processes where controlled time delays improve operational coordination and system reliability. Common applications include:
- Pump start-up and shutdown sequencing in HVAC systems
- Motor soft-start and star-delta switching control
- Safety interlock timing in industrial machinery
- Process automation cycle timing (conveyor systems, packaging lines)
- Lighting control and stairwell occupancy timing
- Furnace and boiler ignition delay circuits
Compatibility & Replacements
Compatible With
- All standard 24 V AC/DC control power supplies
- Industrial control systems using 100–127 V AC or 24 V DC logic
- PLC and relay-based automation platforms
- Motor starters, contactors, and soft-start drives
- DIN rail-mounted control panels
- HVAC, manufacturing, and facility automation systems
Replaces / Drop-In Replacement For
- 3RP1505-1AQ30 (fixed 24 V, 100–127 V AC SPDT variant)
- 3RP1505-1AP30 (fixed 24 V, 200–240 V AC SPDT variant)
- Other 3RP1505-1 series relays with equivalent DPDT contact configuration
Works With
- Control Protocols: Analog timing control (non-networked); compatible with standard electrical control logic
- Software Platforms: No software required; operates as a standalone analog timer
- Mounting Systems: 35 mm DIN rail standard mounting
- Related Siemens Products: SIRIUS relays, contactors, and control components in the Siemens automation portfolio
- Successor Series: This 3RP15 timing relay is being replaced by a device from the 3RP25 series.
