Omron – H3BG‑8 (H3BG‑N8/H3BG‑8H) – Star–Delta Timer Relay, 100‑120 VAC, 5 A

The Omron H3BG‑8 is a rugged 8‑pin plug-in star‑delta timing relay designed for controlling motor start sequences in industrial applications. It offers adjustable star-connect timing and automatic transfer to delta, with self-reset functionality. Some versions (H3BG‑8H) also include an instantaneous output contact for additional control flexibility.

🔧 Key Features

• Model / P/N: H3BG‑8 (also H3BG‑N8, H3BG‑8H for extra instantaneous contact)  

• Supply Voltage:

  • Standard H3BG‑8: 100–120 VAC, 50/60 Hz

  • H3BG‑N8 variant: 220 VAC  

• Timing Range: 0.5–120 s with four selectable scales (e.g., 0.5–6, 1–12, 5–60, 10–120 s)  

• Star–Delta Transfer Time: User-selectable from 0.05 to 1.0 s  

• Outputs:

  • Two time-limit SPST-NO contacts (star and delta)

  • H3BG‑8H adds an instantaneous SPST‑NO contact  

  • Contact Rating: 5 A @ 250 VAC (resistive)  

• Reset Method: Self-reset after timing cycle completes  

• Mounting: 8-pin octal plug-in socket (e.g., P2CF-08); surface or panel mounting with covers/adapters  

• Approvals: UL, CSA, CE, CCC compliant; insulation withstand 2 kVAC, impulse withstand up to 4.5 kV  

• Performance Specs:

  • Timing accuracy ±0.3% FS; setting error ±5% FS ±50 ms

  • Power consumption approx. 2.3 W (110 VAC) / 7 W (220 VAC)  

• Environment: –10 °C to +55 °C, 35–85% RH; resistant to vibration and shock per IEC standards  

• Dimensions: Approx. 45 × 45 × 93 mm; weight ~110 g (H variant ~130 g)