WEG CWM18-00-40V37 : 4-Pole Lighting Contactor, Normally Open (4 NO), 277 VAC 60 Hz / 230-240 VAC 50 Hz Coil, 32A AC-1, 18A AC-3, Replaces EE Controls LSN7-400-H
The WEG CWM18-00-40V37 is a 4-pole contactor with four normally open main contacts, no auxiliary contacts and a 277 V 60 Hz / 230-240 V 50 Hz control coil. It is rated 32 A AC-1 at 690 V or less and 18 A AC-3 at 440 V or less, with a UL 508 rating of 15 HP at 600 V three-phase. All four poles switch together from one control signal and open when the coil is de-energized, so lighting circuits go off on a loss of control power.
Replaces: EE Controls LSN7-400-H (discontinued). Same 4-pole normally open arrangement.
Best for: 4-pole normally open lighting and general purpose switching on a 277 VAC (60 Hz) control circuit, including direct replacement of the EE Controls LSN7-400-H.
Key Features
Four normally open poles
Switches up to four circuits from one control signal. Contacts open when the coil drops out, so lights go off on loss of control power.
277 V 60 Hz / 230-240 V 50 Hz coil
Pick-up at 0.4 to 0.76 x Us and drop-out at 0.25 to 0.65 x Us, with 70 VA inrush and 2.6 W heat dissipation.
32 A AC-1, 18 A AC-3
Rated 32 A for resistive and general purpose loads at 55 °C, 18 A for motor duty at 440 V or less, and 23 A AC-5b (indicative) for incandescent lamp loads.
UL 508 and IEC 60947-1
UL 508 motor ratings up to 15 HP at 600 V three-phase, 5 kA short-circuit rating at 600 V, and CE, UL and EAC certifications.
Panel or DIN rail mounting
Mounts on a 35 mm DIN rail or by screws to a panel (35 x 73 mm hole spacing) in a 45 mm wide body.
10 million mechanical operations
Mechanical life of 10 million operations and electrical life of 1.2 million operations at AC-3.
ZOT Supply is an authorized distributor of EE Controls, supplier of the WEG CWM replacement for the LSN7 line.
Technical Specifications
| Specification | Value |
|---|---|
| Catalog number | CWM18-00-40V37 |
| WEG product code | 19196077 |
| Coil voltage | 277 V 60 Hz / 230-240 V 50 Hz |
| Main contacts (power) | 4 NO |
| Auxiliary contacts | None |
| Coil terminals | 4 |
| Coil pick-up / drop-out | 0.4 to 0.76 x Us / 0.25 to 0.65 x Us |
| Coil inrush (closing) | 70 VA |
| Coil heat dissipation | 2.6 W |
| Operating time, closing / opening | 8 to 20 ms / 6 to 13 ms |
| Rated operational voltage Ue, IEC / UL | 690 V / 600 V |
| Rated insulation voltage Ui, IEC / UL | 1000 V / 600 V |
| Rated impulse withstand voltage Uimp | 6 kV |
| Frequency limits | 25 to 400 Hz (current reduction above 60 Hz) |
| Rated current AC-1 (55 °C, Ue 690 V or less) | 32 A |
| Rated current AC-3, Ue 440 V or less / 690 V or less | 18 A / 13 A |
| Rated current AC-4, Ue 440 V or less | 8 A |
| Lamp switching AC-5b (incandescent), indicative | 23 A |
| UL motor rating, 1-phase 120 V / 240 V | 1 HP / 3 HP |
| UL motor rating, 3-phase 200 V / 240 V / 480 V / 600 V | 5 / 5 / 10 / 15 HP |
| IEC motor rating AC-3, 220-240 V / 380-400 V / 415-440 V / 660-690 V | 4.5 / 7.5 / 9.2 / 11 kW |
| AC-1 resistive load, 220-240 V / 380-400 V / 415-440 V / 500 V / 660-690 V | 12 / 22 / 23 / 27.5 / 36.5 kW |
| Making capacity | 300 A |
| Breaking capacity, 400 V or less / 500 V / 690 V | 250 A / 250 A / 130 A |
| Short-circuit rating, 600 V UL / CSA | 5 kA |
| Fuse protection gL/gG, type 1 / type 2 coordination | 63 A / 35 A |
| Mechanical life (AC coil) | 10 million operations |
| Electrical life, AC-3 | 1.2 million operations |
| Degree of protection, main / control circuit | IP10 / IP20 |
| Terminals | Screw, M3.5 flat / Phillips |
| Tightening torque, power / control | 1 to 1.5 N·m (15 lb.in) / 0.8 to 1.1 N·m (10 lb.in) |
| Power conductor, rigid | 1 or 2 x 0.5 to 6 mm² |
| Mounting | Panel (screw) or 35 mm DIN rail |
| Mounting hole spacing | 35 x 73 mm |
| Dimensions, H x W x D | 81 x 45 x 87 mm (3.19 x 1.77 x 3.43 in) |
| Weight | 300 g (0.66 lb) |
| Operating temperature | -25 to +55 °C (-13 to +131 °F) |
| Storage temperature | -55 to +80 °C (-67 to +176 °F) |
| Altitude without derating | 3,000 m |
| Standards | IEC 60947-1, UL 508 |
| Certifications | CE, UL, EAC |
| Replaces | EE Controls LSN7-400-H |
Documentation
Frequently Asked Questions
What is the coil voltage of the WEG CWM18-00-40V37?
The coil is rated 277 V 60 Hz / 230-240 V 50 Hz. On a 60 Hz control circuit in North America, use it as a 277 VAC coil.
What happens to the contacts when control power is lost?
All four main contacts are normally open, so they open when the coil is de-energized and the lighting circuits go off.
What current is the CWM18-00-40V37 rated for?
32 A under AC-1 (resistive and general purpose loads, 55 °C, 690 V or less), 18 A under AC-3 for motors at 440 V or less (13 A at 690 V), and 23 A under AC-5b for incandescent lamps as an indicative value. For ballast and LED driver circuits, call Team Zot at 855-825-2811 and we will help size the contactor.
Does the WEG CWM18-00-40V37 replace the EE Controls LSN7-400-H?
Yes. The CWM18-00-40V37 is the replacement for the discontinued EE Controls LSN7-400-H. Both are 4-pole normally open contactors, and the 277 VAC coil matches at 60 Hz.
What is the difference between the AC-1 and AC-3 ratings?
They are IEC utilization categories for different loads. AC-1 covers resistive and slightly inductive loads such as heaters and general purpose circuits, so it is the higher figure: 32 A. AC-3 covers starting and stopping squirrel-cage motors, where inrush is much higher, so the rating is lower: 18 A at 440 V or less. Size the contactor to the category that matches your load.
How does the CWM18-00-40V37 mount and what size is it?
It mounts on a 35 mm DIN rail or by screws to a panel with 35 x 73 mm hole spacing. The body is 81 mm high, 45 mm wide and 87 mm deep (3.19 x 1.77 x 3.43 in) and weighs 300 g.
Does the CWM18-00-40V37 have auxiliary contacts?
No. It has four normally open main contacts and no auxiliary contacts.
Specifications: WEG datasheet, product code 19196077 (CWM18-00-40V37), issued 10/11/2026; WEG CWM Contactors catalog, Cod 50070163 Rev 06, 12/2020; WEG Automation catalog, CWM Series section (US300C, 07/2017). Reviewed 10 November 2026.
- # of Poles:
- 4
- Coil Voltage:
- 277VAC
- Configuration:
- Normally Open
- Current Rating:
- 32A AC-1
- AC-3 Current Rating:
- 18A
