Nanjing KJT Electric Co,.LTD
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 |
|
NOTE Switch travel diagram
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