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Brand: Allen-Bradley
Allen-Bradley 440J-N21TNPM Three-Position Enabling Switch
Description
A hand-held three-position enabling grip switch with IP66 body
The Allen-Bradley 440J-N21TNPM is a three-position enabling grip switch for teaching and maintenance in hazardous areas, such as programming a robot. The machine may run only in position 2, the middle position, and both a release (position 1) and a hard squeeze (position 3) stop it.
This basic version carries no additional buttons. The product page lists two N.C. main contacts and two N.O. monitoring contacts in a plastic body with a terminal chamber, an M20 conduit entry and cable strain relief.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 440J-N21TNPM |
| Type | Three-position enabling switch, no additional buttons |
| Contact data (product page) | 2 N.C. main contacts, 2 N.O. monitoring contacts |
| Contact data (installation sheet) | Two contacts on terminals 1-2 and 3-4; 1 N.C. auxiliary on 5-6 |
| Protection | IP66 |
| Conduit entry | 1 x M20 |
| Cable diameter | 7 to 13 mm |
| Operating temperature | -10 to +60 C |
| Thermal current | 2.5 A |
| Minimum load | 3V, 5 mA AC/DC |
| Rated voltage (3-position contacts) | 30V / 125V / 250V; AC-12 1 A at 125V |
| Short-circuit protection | 250V, 10 A fuse (IEC 60127-1) |
| Insulation voltage / impulse | 250V / 2500V; pollution degree 3 |
| Operating force | About 15 N at position 2; 50 N maximum at position 3 |
| Mechanical life | 1,000,000 (positions 1-2-1); 100,000 (1-2-3-1) |
| Actuation frequency | 1200 operations per hour maximum |
| Weight | 195 g |
| Wire size | 0.2 to 1.5 mm2, push-in terminals |
Safe use
The installation sheet requires each contact pair, terminals 1-2 and 3-4, to be connected to a discrepancy-detection circuit such as a safety relay. The example circuit uses an MSR127RP relay, and the monitoring device must detect cross-short circuits. Never tape or tie down the button, since that defeats the function.
The enabling system should be configured so that the machine can run only in position 2. Passing to position 3 or releasing the grip must switch the enabling function off, as the contact chart in the sheet shows for each terminal pair.
Enabling switches are used together with a mode selector so that the slow, hand-guided mode is only available when the key switch is in the teach or maintenance position. The operator holds the grip lightly to keep the machine in position 2, and the listed operating force rises from about 15 N at position 2 to 50 N maximum at position 3. The IP66 rating covers dust and water jets at the body, but the M20 cable entry must be sealed with a suitable gland to keep that rating.
Practical details
Wiring uses push-in terminals for 0.2 to 1.5 mm2 conductors, with ferrules 0.2 to 0.75 mm2 for stranded wire. Strip 8 to 9 mm, and use 60/75 C copper only. Pusher force should be about 20 N and never above 40 N.
Product pages and the sheet differ in how the contacts are described, so confirm the terminal arrangement against your machine drawings before ordering.
Related Allen-Bradley products: Allen-Bradley 440C-CR30-22BBB CR30 Configurable Safety Relay, Allen-Bradley 440G-T27121 TLS-1 GD2 Guard Locking Switch, Allen-Bradley 440G-LZS21SPRH LZ RFID Guard Locking Switch, Allen-Bradley 440R-ENETR GSR EtherNet/IP Interface, Allen-Bradley 440R-N23124 MSR127T Safety Relay 230V AC and Allen-Bradley 440R-N23135 MSR127RP Safety Relay 24V AC/DC.
Ordering and documents
Order 440J-N21TNPM exactly as printed. The hosted document is the 440J-N enabling switch installation instructions 440J-IN001, and the photo is the official Rockwell product photograph of this part. Other safety devices are listed in the Safety Switches & Guard Locking category.
Seven Star LLC is an independent supplier in Muscat and quotes on request. Please confirm the catalog number, ratings and the current product status against the latest Rockwell Automation documents before ordering.
Datasheets & Documents
- Installation instructions 440J-N Enabling Switch Installation Instructions (440J-IN001) Download
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About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
FAQ
Questions about the Allen-Bradley 440J-N21TNPM Three-Position Enabling
Answers from our engineering team on installation, compatibility and integration.
01What is 440J-N21TNPM?
A three-position enabling grip switch with no extra buttons, IP66, M20 conduit entry.
02Which position allows the machine to run?
Position 2, the middle position.
03What protection class?
IP66 for this version.
04What operating temperature?
-10 to +60 C.
05What safety device should it connect to?
A monitoring device such as a safety relay with discrepancy and cross-short detection.
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