Marine Limit Switch LX918 - Reliable Limit Switches from China Suppliers and Factory for AC/DC Applications
The LX918 series limit switches are essential components designed for circuits operating at AC frequencies of 50-60Hz, handling voltages up to 500V for AC and up to 440V for DC. These switches effectively limit the travel of various mechanisms, making them ideal for industrial applications. Additionally, they serve as limit switches for 5.5kw three-phase squirrel cage asynchronous motors, ensuring safety by cutting off the main source in two-phase fire scenarios. As a leading manufacturer in China, we pride ourselves on being reliable suppliers of high-quality limit switches, engineered to meet the demands of modern industries. Choose our factory for dependable solutions that enhance operational efficiency
All products of the company can be customized for production according to user usage scenarios.
Structure and working principle
The shell of the limit switch is made of cast iron, which has good mechanical strength and good corrosion resistance. The performance of the material will not deteriorate under the environmental conditions of marine ships. The shell type is protective, and the protection level can reach IP67. Due to the action of the spring, it can automatically reset. Operating position: 5°→0°-45° The opening and closing of the limit switch contacts are determined by the cam position.
The agreed heating current of the limit switch is 16A; the rated insulation voltage is 500V; the rated working voltage (Uc) and the rated working current (le) correspond to the figure on the right:
The rated working voltage of the DC controlled 5.5Kw three-phase squirrel cage asynchronous motor is below 440V and the rated working current is 12A.
Working conditions
1. Altitude
The altitude of the installation location does not exceed 2,000 meters.
2. Medium temperature
The ambient air medium temperature is not higher than +75℃ and not lower than -25℃.
3. Relative humidity
The average relative air humidity in the wettest month of the installation location is not greater than 90% (the average minimum temperature in the month is not greater than +25°C).
4. Pollution level
The pollution level of environmental conditions is Level III.
5. Installation category
The installation category is Category I.
6. Types of limit switches
Structural types are divided according to structural types: The structure of this product is rotary type, and the speed ratios are: 80:1, 40:1, and 20:1. Control loops are divided according to control loops: this limit switch can be equipped with up to 8 control loops.
Environmental Conditions
Rated Data
Project
Ue (V)
Ie (A)
Environmental control temperature
-25℃-+45℃
AC
500
2.00
Moist air at sea
Yes
380
2.60
Oil, mold
Yes
220
4.60
Tilt
Any tilt
DC
440
0.14
Swing
≤45°
220
0.27
Vibration, shock, shock Britain
Yes
110
0.55
Overall and installation dimensions
A contact group (2) is installed in the travel switch housing, and the moving contact and the stationary contact thereof drive the cam on the switch shaft (4) to open and close the contacts as the operating arm (3) rotates. The positioning of the operating arm is achieved by means of a positioning member (5), a positioning spring (6), a positioning lever (7) and a roller (8).
Use and maintenance
Frequently Asked Questions (FAQ)
Can these limit switches be customized?
Yes, all products of the company can be customized for production according to user usage scenarios.
What are the shell material and protection level of the limit switch?
The shell of the limit switch is made of cast iron, providing high mechanical strength and excellent corrosion resistance. The protection level can reach IP67, making it suitable for marine ship environments.
What are the speed ratios and control loop configurations available?
The structural type of this product is rotary, with speed ratios of 80:1, 40:1, and 20:1. The limit switch can be equipped with up to 8 control loops.
What are the environmental limits for installing the limit switch?
The installation altitude should not exceed 2,000 meters. The ambient air temperature must remain between -25℃ and +75℃, and the average relative humidity should not exceed 90% in the wettest month.
What are the electrical ratings for AC and DC applications?
The rated insulation voltage is 500V and the heating current is 16A. For AC, it supports up to 500V/2.00A. For DC, it supports up to 440V/0.14A.
