Overview
The Amperite 50C30 thermostatic delay relay is a heater-actuated timing device designed for delay-on-break control in industrial and equipment automation. The “C” designation indicates normally closed contact form (Delay on Break), with SPST contact configuration. This unit features hermetically sealed construction that ensures operation is not affected by altitude, moisture or other atmospheric conditions, making it suitable for harsh environments and legacy equipment requiring reliable timing control.
Key Features
- Heater-actuated operation providing simple, maintenance-free timing function
- Operates on AC, DC, or pulsating current
- Contact rating of 115V at 3A AC (or 220V at 0.5A AC), supporting standard industrial load switching
- Heater wattage of 2W (approx.) allowing continuous operation
- Relays compensated for ambient temperatures of −55° to +70°C
- Compact, lightweight design for panel and chassis mounting
Technical Specifications
- Heater Voltage: 50V AC or DC
- Time Delay: 30 seconds
- Contact Configuration: SPST (Single Pole Single Throw)
- Contact Type: Normally Closed (Delay on Break)
- Contact Rating: 115V – 3A AC; 220V – 0.5A AC
- Maximum voltage between contacts and heater: 1500V
- Heater Power Consumption: ~2W
- Operating Temperature Range: −55°C to +70°C
- Contact Life: At least 500,000 operations at 115V–2A AC, non-inductive
- Package: Glass tube envelope with pin connection
- Hermetic Sealing: Yes
Typical Applications
- Industrial control circuits requiring adjustable or preset delay timing
- Equipment startup/shutdown sequencing with delay-on-break logic
- Legacy electrical and automation systems requiring tube-based relay replacement
- Applications where hermetic sealing and environmental immunity are required
- Motor starter circuits and load switching with timed off-delay
Compatibility & Replacements
Compatible With
- 50V AC/DC control circuits and power supplies
- SPST relay sockets and octal/miniature tube bases
- Panel-mount control cabinets and legacy industrial equipment
- Process timers and sequential control logic
Replaces / Drop-In Replacement For
- Edison brand relays with “117” voltage prefix (equivalent to Amperite “115” types) in corresponding delay configurations
- Other Amperite thermostatic delay models with equivalent 50V/30-second specifications
Works With
- Standard relay sockets (octal or miniature tube-style connectors)
- Pneumatic and electromechanical timer systems
- Industrial control contactors and solenoids rated 115V–3A AC or 220V–0.5A AC
- DC control circuits up to 50V with appropriate contact load ratings
