Siemens Industrial Controls 52PP3G2U Switch 323080 701 Optimized Heat Transfer: High grade manufacturing Optimized Heat Transfer: High grade manufacturing ensures the condenser coil fins and tubing provide maximum surface area for efficient thermal exchange it can be paired with up to two remote temperature sensors (Bard 8612 023A) to provide weighted temperature averaging for larger equipment rooms This Command 52 operator features a durable chrome plated metal construction and a 1 3 4" red mushroom head for immediate tactile response and high visibility in busy mechanical rooms preventing "race conditions" in complex relay logic or emergency circuits