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Brand: Allen-Bradley
Allen-Bradley 440G-LZS21SPRH LZ RFID Guard Locking Switch
Description
An RFID guard locking switch with lock-status output and M12 8-pin pigtail
The Allen-Bradley 440G-LZS21SPRH is a 440G-LZ guard locking safety switch with a standard-coded RFID actuator, power-to-release locking and a 24V DC supply. Two PNP safety outputs and one PNP lock-status output are provided, and the switch leaves the housing on a 150 mm pigtail ending in an M12 8-pin connector.
Rockwell’s catalog number explanation reads the part number directly: LZS is the family, 21 means two safety outputs and one auxiliary, S is a standard (non-unique) actuator code, P is a lock-status auxiliary, R is power to release and H is the M12 8-pin connection.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 440G-LZS21SPRH |
| Family / code | 440G-LZ; 21 = two safety + one auxiliary; S = standard code; P = lock status; R = power to release; H = M12 8-pin |
| Operating voltage | 24V DC +10% / -15%, Class 2 SELV |
| Safety outputs | 2 x PNP, 0.2 A max |
| Auxiliary output | 1 x PNP, 0.2 A max (lock status) |
| Safety classification | PLe Category 4 (ISO 13849-1), SIL 3 (IEC 61508 / 62061) |
| PFHd | 9.1 x 10-10 per hour; mission time 20 years |
| Holding force Fmax / Fzh | 1690 N / 1300 N (EN ISO 14119) |
| Mechanical life | 500,000 cycles |
| Response time (off) | 100 ms first switch, plus 50 ms per additional switch |
| Start-up time | 5 s |
| Quiescent power | 2.5 W; 400 mA peak for 100 ms |
| Operating temperature | 0 to +55 C |
| Enclosure rating | NEMA 3, 4X, 12, 13; IP66, IP67, IP69K |
| Weight | Switch 400 g; actuator 150 g; bracket 60 g |
| Materials | ABS body; 304 stainless steel bolt and bracket |
| Manual release | Built in |
Using the data
The locking bolt must insert 5 to 10 mm for the stated holding force, and alignment tolerance is plus or minus 2.5 mm. Mounting torque for the M5 screws is 2 N-m maximum. Switches can be chained, with a maximum chain length of 10 km depending on cable and response time, and each switch adds 50 ms to the response time.
LED patterns explain the lock status: solid green means locked with OSSD on, slow flash green means locked with OSSD off, and solid red indicates unlocked. A lock command while the switch is still unlocked produces a fast green flash.
Compared with mechanical tongue-type locks, the RFID actuator is a non-contact design with a flat, easily cleaned face, and the standard code (S) means any standard-coded actuator of the family will be accepted. If tamper resistance is more important than interchangeability, the catalog number explanation shows a unique-code option (U) in the same family. Use the lock-status output in the control program to prevent a start until the bolt is confirmed in place.
Applications
With IP69K washdown protection and a stainless locking bolt, the switch fits food, beverage and chemical packaging lines, as well as heavy industrial guards. Use the lock-status output to tell the controller that the door is really locked before the hazard starts.
The sheet recommends a risk assessment, regular checks of the guard and a mechanical stop at the door, since the switch is not designed to be a door stop.
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 440J-N21TNPM Three-Position Enabling Switch, Allen-Bradley 440R-N23124 MSR127T Safety Relay 230V AC, Allen-Bradley 440R-ENETR GSR EtherNet/IP Interface and Allen-Bradley 440R-N23135 MSR127RP Safety Relay 24V AC/DC.
Ordering and documents
Order 440G-LZS21SPRH exactly as printed. The hosted document is the 440G-LZ installation instructions 440G-IN011, 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 440G-LZ Guard Locking Safety Switch Installation Instructions (440G-IN011) Download
Reviews (0)
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 440G-LZS21SPRH LZ RFID Guard Locking
Answers from our engineering team on installation, compatibility and integration.
01What is 440G-LZS21SPRH?
A 440G-LZ RFID guard locking switch, power to release, 24V DC, with two PNP safety outputs and lock-status output.
02What does the H mean?
An M12 8-pin connection, here on a 150 mm pigtail.
03What safety rating applies?
PLe Category 4 and SIL 3.
04What holding force is listed?
1690 N Fmax and 1300 N Fzh.
05What is the IP rating?
IP66, IP67 and IP69K.
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