C230A (2-pole 30 A)
The generic 2-pole 30 A definite-purpose contactor found in condensers, small recips and air handlers everywhere. Box-lug terminals, universal mounting plate, interchangeable with Mars/JARD and Titan equivalents.
- FLA (inductive)
- 30 A @ 240–600 V
- LRA (locked rotor)
- 180 A @ 240 V · 150 A @ 480 V
- Resistive
- 40 A
- Utilization
- Definite purpose (UL 508), AC-8a equivalent
- Single-phase HP
- 2 HP @ 115 V · 5 HP @ 230 V
- Available coil voltages
- 24 VAC (most common), 120 VAC, 208–240 VAC
- Inrush VA
- ≈ 31 VA
- Sealed (holding) VA
- ≈ 5 VA
- Pickup voltage
- ≥ 85% of rated coil voltage
- Dropout voltage
- 20–65% of rated
OL = open coil · near zero = shorted turns · coil-to-frame must read >1 MΩ.
Coil resistance checker
Pick the coil voltage, enter your meter reading across A1–A2 (coil disconnected), and compare it to the expected ballpark.
OL = open coil. 0–2 Ω = shorted turns (often from a cooked transformer). Ballpark only (±15%+); electronic wide-range coils (e.g. ABB AF) read misleading values — test those at rated voltage instead. Always measure coil-to-frame too: must be >1 MΩ.
- Mars 780 series (17155 / 61471 24 VAC)
- Titan TPD302C
- Eaton C25BNB230
- Siemens/Furnas 42BF35AJ
- ABB DP30C2P
- Chatter at 24 V almost always means a loaded-down control transformer — measure coil volts while energized, not open-circuit.
- Pitted contacts that look 'fine' can still drop 1–2 V across each pole; measure voltage drop T1→L1 under load — anything over ~2% of line voltage is a replace.
- Never file silver-alloy contact tips; replacement costs less than the callback.
Links go to the manufacturer's current catalog or product page — model-specific pages are often retired, so these stay live.