Potter BMC-33B Anti-Defeat Double Bias Magnetic Contact, High Security Balanced

Secure critical entry points with the Potter Electric Signal BMC-33B Anti-Defeat Double Bias Magnetic Contact — designed for high-security intrusion detection and tamper-resistant monitoring. This magnetic contact uses a unique triple-polarized magnet layout and pre-biased reed switches to produce a perfectly balanced magnetic field. Any attempt to bypass the sensor with an external magnet creates imbalance and instantly triggers an alarm, improving the integrity of access control and alarm panels.

Built for dependable field use, the BMC-33B supports a 1 3/8" to 3" operating gap for versatile mounting and includes a 24" armored cable to resist vandalism and simplify wiring. Its anodized aluminum housing and Alnico 6 magnets resist corrosion for sustained performance in both interior and exterior applications. The unit supports N.C. and N.O. contact types and integrates easily with surveillance, monitoring, and security systems.

Ideal for commercial doors, perimeter security, and high-risk installations, the Potter BMC-33B provides a practical, high-security solution that minimizes tampering risk. Add the BMC-33B to your next access control or alarm installation to bolster protection and reliability.

• Tamper-resistant design prevents magnetic bypass attempts, reducing false negatives and enhancing intrusion detection.
• Balanced triple-polarized magnet arrangement creates a symmetrical field for reliable monitoring even under attack.
• Wide 1 3/8" to 3" operating gap allows flexible mounting on a variety of doors and frames for fast installation.
• 24" armored cable and anodized aluminum housing deliver durable, vandal-resistant performance in high-use environments.
• Alnico 6 magnets and corrosion-resistant construction ensure long service life for security and surveillance systems.