Description
The Littelfuse HRDB223 is a high-performance Delay On Break timing relay engineered for industrial and commercial control applications where controlled shutdown sequencing is critical. By maintaining output for a preset duration after input voltage is removed, the HRDB223 ensures smooth system transitions, prevents abrupt shutdowns, and protects sensitive downstream equipment from voltage spikes and mechanical stress.
Built to perform in demanding environments, this timer delivers consistent, repeatable timing accuracy across automation systems, HVAC controls, and machinery operations. Its rugged construction and low-maintenance design translate to extended service life and reduced downtime — making it a trusted solution for engineers and technicians who need reliable timing performance day after day.
Key Features
- Delay on break functionality ensures controlled, sequenced shutdown timing
- High-accuracy, repeatable timing performance for consistent system operation
- Rugged construction rated for demanding industrial environments
- Straightforward integration into existing control panels and systems
- Compact form factor maximizes panel space efficiency
- Low-maintenance design supports long service life and reduced operational costs
Ideal Applications
- HVAC system controls and fan delay sequencing
- Industrial automation and machinery operation
- Commercial control panel installations
- Equipment protection and soft shutdown circuits







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