Banner Engineering MGCA-4A Machine Guard Control Box

MGCA-4A Machine Guard Control Box is Banner Engineering's 115V AC control module for the MACHINE-GUARD System, designed to coordinate with MGE-series light-curtain emitters and MGR-series receivers to stop the guarded machine when a protected zone is breached. It houses the central controller and two redundant output-relay modules (FSD and SSD) with forced-guided contacts to ensure reliable, fail-safe interlocks, and the system is specified for one control box per guarding setup; this arrangement is part of Banner's “diverse redundancy” approach that checks components against each other to maintain safety even if one part fails. The enclosure measures about 9.0 inches wide by 9.5 inches high by 5.0 inches deep, weighs roughly 9 pounds, and operates on 115V AC with a 50/60 Hz supply; the power-supply board houses a 250V AC 3AG slow-blow fuse that may be tested and replaced per Banner maintenance guidelines. The MACHINE-GUARD System supports blanking options inside the control box—floating blanking or exact blanking—to accommodate fixtures or moving workpieces within the curtain, enabling safe operation around accumulated hardware in the guarded area. Note that Banner catalogs the MACHINE-GUARD family as being discontinued and directs engineers to replacement paths, while 230V variants exist as MGCB-4A for 230 VAC installations; typical applications include safeguarding hydraulic and pneumatic presses and automated production lines that rely on infrared-beam safety curtains to halt machinery on intrusion.