KJT heavy-duty limit switch is a mechanical control switch, which is used for conveyor belt deviation prevention, crane over-roll protection, and rope pull switch. Taking advantage of its high reliability, it is widely used in steel equipment, large conveying machinery, loading and unloading machinery and cement equipment. Resistant to harsh environments. The glass sealing joint is filled with inert gas

Product parameters
model	MD 441-11Y-M20	TD 441-11Y-M20	MD 441-11Y-T-M20	MD 441-11Y-T-2512	TD 441-11Y-2512
Principle of action	Mechanical	Mechanical	Mechanical	Mechanical	Mechanical
Shell raw materials	Gray cast iron, galvanized	Gray cast iron, galvanized	Gray cast iron, galvanized	Gray cast iron, galvanized	Gray cast iron, galvanized
Contact    material	silver	silver	silver	silver	silver
gross weight	1,650g	1,675g	1,695g	1,650g	1,845g
Normally closed quantity (NC)	1	1	1	1	1
Normally open quantity (NO)	1	1	1	1	1
B 10D normally closed contact (NC)	2,000,000 operations	2,000,000 operations	2,000,000 operations	2,000,000 operations	2,000,000 operations
operating units	roller lever	roller lever	roller lever	roller lever	roller lever
Roller material	plastic	plastic	brass	brass	Brass/Plastic (can be customized)
Mechanical life	5,000,000 operations	10,000,000 operations	5,000,000 operations	5,000,000 operations	5,000,000 operations
action angle, Counting from the left side of the switch shaft	30°	30°	30°	30°	30°
action angle, Counting from the right side of the switch shaft	30°	30°	30°	30°	30°
contact open circuit	2×2.5mm	2×6mm	2×2.5mm	2×2.5mm	2×2.5mm
Minimum drive speed	1mm/分钟	1mm/min	1mm/min	1mm/min	1mm/min
Maximum action speed	3m/sec	3m/sec	3m/sec	3m/sec	3m/sec
Notice	Action speed: Driving speed of the vertical drive angle switching axis	Action speed: Driving speed of the vertical drive angle switching axis	Action speed: Driving speed of the vertical drive angle switching axis	Action speed: Driving speed of the vertical drive angle switching axis	Action speed: Driving speed of the vertical drive angle switching axis
Circuit connection	Screw connection M20 x 1.5	Screw connection M20 x 1.5	Screw connection M20 x 1.5	Screw connection M20 x 1.5	Screw connection M20 x 1.5
Minimum cable cross-section	1.5mm²	1.5mm²	1.5mm²	1.5mm²	1.5mm²
Maximum cable cross section	2.5mm²	2.5mm²	2.5mm²	2.5mm²	2.5mm²
Notice	Cable part: including conductor ferrules	Cable part: including conductor ferrules	Cable part: including conductor ferrules	Cable part: including conductor ferrules	Cable part: including conductor ferrules
Wire cross section	13 AWG	13 AWG	13 AWG	13 AWG	13 AWG
Product Size
length, width and height	63mm*106mm*237mm	63mm*106mm*237mm	63mm*106mm*237mm	63mm*106mm*237mm	63mm*106mm*192mm
Caster width	9mm	9mm	9mm	9mm	9mm
Caster diameter	36mm	36mm	36mm	36mm	36mm
Application environmental conditions
Protection level	IP65	IP65	IP65	IP65	IP65
ambient temperature	-30 ... +90°C	-30 ... +90°C	‘-40 ... +200°C	‘-40 ... +200°C	‘-40 ... +200°C
Rated insulation voltage	250 VAC	400 VAC	250 VAC	250 VAC	250 VAC
Rated impulse withstand voltage	4kV	6kV	6kV	4kV	4kV
Electrical data
Thermal test current	16A	16A	16A	16A	16A
Application categories	AC-15: 250 V / 4 A	AC-15: 400 V / 4 A	AC-15: 250 V / 4 A	AC-15: 250 V / 4 A	AC-15: 250 V / 4 A
switching element	Normally open contact, normally closed contact	Normally open contact, normally closed contact	Normally open contact, normally closed contact	Normally open contact, normally closed contact	Normally open contact, normally closed contact
Switching principle	quick action	slow movement	quick action	quick action	quick action
Maximum bounce duration	5 ms	/	5 ms	5 ms	5 ms
Maximum switching time	35 ms	/	35 ms	35 ms	35 ms