DCC Specialties OnGuard! OG-CB Circuit Breaker
Note: Not for direct current (DC) applications, NCE Power Cab or Digitrax Zephyr

• 4 Amps
• Easy to Install Screw Terminals
• No Relays
• 1 Year Warranty
• Low Cost
• No Power Supply Required 
 
MSRP $29.95  dspogcb
https://tonystrains.com/product/dcc-specialties-onguard-og-cb-circuit-breaker