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Allen Bradley Guardmaster Safety Relays 440N-Z21S17H

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440N-Z21S17H

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The 440N-Z21S17H is a non-contact safety switch from Allen Bradley's Guardmaster Safety Relays series. It operates at 24 Volts DC and features multiple outputs, including two Positive-Negative-Positive (PNP) safety outputs along with one auxiliary output, designed to enhance safety monitoring in automation applications.

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Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 440N-Z21S17H

ManufacturerAllen Bradley
Product TypeNon-Contact Safety Switch
Product LineGuardmaster Safety Relays
Part Number440N-Z21S17H
Weight0.25 lbs (0.11 kg)
UPC662074620579
Output Type2 Positive-Negative-Positive (PNP) safety outputs and 1 Positive-Negative-Positive (PNP) auxiliary output
Output Current Rating200 milliamperes for all outputs
Repeat Accuracy10% of sensing range
Operating Voltage24 Volts DC
Response Time54 milliseconds (off)
Current Consumption50 milliamperes
Operating Cycle Frequency1 Hertz
Switching Distance10 millimeters
Sensor PrincipleRadio-Frequency Identification (RFID)
Housing MaterialStainless steel
Enclosure RatingIP69K
Safety Contact Configuration2 Normally Closed (NC) contacts
Actuator TypeCoded actuator
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The Allen Bradley 440N-Z21S17H is a robust non-contact safety switch designed to meet stringent industrial safety standards. This device operates with an input voltage of 24 Volts DC and is particularly equipped with two Positive-Negative-Positive (PNP) safety outputs, coupled with one PNP auxiliary output. Each of these outputs supports a current rating of 200 milliamperes, contributing to its effectiveness in providing reliable safety functionality.

Sensing accuracy is maintained at 10% of the overall sensing range. The switch reacts within a rapid 54 milliseconds when turned off, facilitating quick responses in safety applications. With a current consumption of only 50 milliamperes and an operating cycle frequency of 1 Hertz, this unit is efficient in its functional setup.

The switching distance of the safety switch measures 10 millimeters, leveraging radio-frequency identification (RFID) technology to enhance operational reliability. Encased in a stainless-steel housing, it provides durability and resistance to tough conditions. The enclosure is rated IP69K, indicating it is impervious to water and dust ingress, making it suitable for harsh environments. Configuration of the safety contacts includes two Normally Closed (NC) contacts, adding another layer of safety, while the coded actuator ensures that it operates only with the designed actuating device.