Guardmaster 440L Light Curtains

The Allen-Bradley Guardmaster 440L is a family of Type 4 safety light curtains and single-beam area access control (AAC) sensors designed to guard hazardous machine zones without physical barriers. The 217-SKU catalog spans transmitters, receivers, pre-matched pairs, cascade-ready units, and alignment tools, all sold under the 440L bulletin. Decoding the catalog number is straightforward: the first character after 440L- indicates the component role — T for transmitter, R for receiver, P for a matched pair, F for a cascade receiver, and C for a cascade pair. The following digit confirms Type 4 safety rating, the next letter indicates resolution (J = 14 mm, K = 20 mm), and the four-digit numeric field encodes protected height in millimeters — for example, 0800 = 800 mm, 1280 = 1,280 mm. Suffix characters identify connector style and feature set. Popular in-stock examples include the 440L-P4KL0800YD (20 mm resolution, 800 mm pair), 440L-P4JL1280YD (14 mm resolution, 1,280 mm pair), and the single-beam 440L-T4F2070-Q transmitter for area access control applications. The 440L-ALAT laser alignment tool simplifies installation of any GuardShield curtain. Full specifications and dimensional data are available in the Guardmaster 440L Light Curtain Technical Data Sheet.