CWB12 (3-pole 12 A)
WEG · CWB 9–18 A frame (45 mm)
One step up from the CWB9 on the same 45 mm frame — the usual pick for 3–5 HP 460 V shop compressors, dryer fans and pump starters.
Ratings
- AC-3 (440 V)
- 12 A
- AC-1 (resistive)
- 25 A
- Hp (3Φ)
- 3 HP @ 230 V · 7.5 HP @ 460 V
- Aux rating
- AC-15, 6 A @ 240 V
- Three-phase HP
- 3 HP @ 230 V · 7.5 HP @ 460 V
Coil data
- Available coil voltages
- 24, 42, 110–120, 208–240, 380–415, 440–480, 550–600 VAC 50/60 Hz; 24 VDC
- Inrush VA
- ≈ 65 VA
- Sealed (holding) VA
- ≈ 8 VA
- Pickup voltage
- ≥ 80% of rated
- Dropout voltage
- ≈ 30–60% of rated
Typical measured coil resistance (±15%, ballpark)
24 VAC≈ 8–16 Ω
120 VAC≈ 180–320 Ω
240 VAC≈ 750–1,300 Ω
480 VAC≈ 3,000–5,200 Ω
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.
Ω
This model (24 VAC table value)8 Ω–16 Ω
Generic small-frame 24 VAC8 Ω–16 Ω
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.
Terminals & accessories
Power/coil terminals: L1–L3 top, T1–T3 bottom; box lug to 10 mm² / 8 AWG; coil A1/A2 front
Auxiliary contacts: 1 built-in (NO or NC per part number); front block BCXMF adds 2 or 4
Companion overload: RW27D thermal overload direct-mount, or RW17 electronic
Cross-references
- Schneider LC1D12
- Siemens 3RT2017
- ABB AF12
- Allen-Bradley 100-C12
- Eaton XTCE012B
- Legacy WEG CWM12
Field notes
- CWB9 and CWB12 share the same body and accessories — if you only have a CWB12 on the truck it drops straight in for a CWB9.
- Direct-mount RW27D overload clips on without wire jumpers; make sure the dial is set to motor nameplate FLA, not the contactor rating.
- A 120 V coil reading under ~100 Ω on this frame is a shorted winding — the coil will pull in then cook the control transformer.
WEG resources
Links go to the manufacturer's current catalog or product page — model-specific pages are often retired, so these stay live.
Manufacturer documentation