Overview
The Siemens 7KT5 745 hour counter is a compact electromechanical timing device engineered for DC-powered industrial control systems. Operating across a wide 10–27 VDC range, this 6-digit counter delivers dependable cumulative hour measurement for production equipment, motors, compressors, and other machinery requiring uptime tracking and maintenance interval management. Although discontinued by Siemens, this model remains essential for legacy system repairs and modernization projects where original equipment replacement is required.
Key Features
- 6-digit mechanical display for clear, direct hour reading
- Wide operating voltage: 10–27 VDC accommodates diverse power supplies
- Compact form factor suitable for panel mounting and retrofit installations
- Non-resettable operation ensures accurate maintenance scheduling and equipment history
- Low power consumption minimizes load on control circuits
- Robust electromechanical construction for harsh industrial environments
Technical Specifications
The 7KT5 745 delivers consistent performance across standard industrial operating ranges:
- Operating Voltage: 10–27 VDC
- Display Type: 6-digit mechanical counter
- Function: Cumulative hour counter (non-resettable)
- Input Current: Low-draw DC circuit
- Installation Method: Panel mount
- Enclosure Rating: IP20 (typical for relay modules)
- Operating Temperature: 0 to +50°C (standard industrial)
- Weight: Approximately 60–70 grams
- Manufacturer Status: Discontinued
- Certification: Built to Siemens industrial standards
Typical Applications
The 7KT5 745 is ideal for:
- Motor runtime monitoring in HVAC and industrial fan systems
- Compressor and pump uptime tracking for predictive maintenance
- Production line equipment runtime logging
- Generator and backup power system hour recording
- OEM machinery rebuild and retrofit projects requiring original-equivalent replacement
- Facility management and asset lifecycle tracking
Compatibility & Replacements
Compatible With
- Siemens SIRIUS control modules and relay terminals
- Industrial PLC and automation systems using 10–27 VDC logic
- Standard DIN rail enclosures and control panels
- OEM machinery with original 7KT5-series hour meter specifications
Replaces / Drop-In Replacement For
- Original Siemens 7KT5 745 units in legacy equipment
- Direct mechanical hour counter replacement in panel retrofits
- Verify mounting dimensions and terminal configuration with your system integrator before ordering.
Works With
- 10–27 VDC control bus architectures
- Hardwired relay logic and contactor systems
- Industrial automation control panels requiring hour meter feedback
- Facility CMMS (Computerized Maintenance Management Systems) supporting manual hour log entry
