The KnoxBox 3200 and KnoxVault 4400 systems utilize a multipurpose electrical switch designed for controlling access to doors, gates, and other electrical equipment. This article details the installation, operation, and compatibility of this switch, based on provided documentation. The switch is intended for use with low-voltage circuits, though compatibility with higher voltage devices is possible with the use of an intermediate control relay. The documentation specifies a maximum load of 28 Volt AC/DC at 5 Amps. The switch can be configured for either normally open or normally closed circuit operation.
System Overview and Compatibility
The KnoxBox 3200 electrical switch is designed to interface with a variety of access control systems, including those employing Maglock-type locks. It is also suitable for operating gates and other electrical equipment. The documentation indicates that this switch is compatible with KnoxBox 3200 units manufactured since April 2002 and KnoxVault 4400 units manufactured since January 2003. The switch assembly replaces the right key hook bracket in the KnoxVault 4400 configuration, utilizing existing mounting holes.
Mounting Configurations
Two primary mounting configurations are detailed: the KnoxBox 3200 and the KnoxVault 4400. The documentation emphasizes that the backplate is shown without the housing for clarity in the diagrams.
KnoxBox 3200 Mounting
The KnoxBox 3200 mounting utilizes screws, a key hook, and a bracket to secure the switch assembly. The switch assembly is positioned near a wire exit opening. The documentation illustrates the arrangement of these components without the surrounding housing.
KnoxVault 4400 Mounting
The KnoxVault 4400 mounting differs in that the switch assembly replaces the existing right key hook bracket. This replacement is designed to avoid the need for new mounting holes. The configuration includes screws, a key hook, the bracket, and the switch assembly, also positioned near a wire exit opening.
Electrical Operation: Normally Open vs. Normally Closed
A key feature of the KnoxBox 3200/4400 electrical switch is its ability to operate as either a normally open or normally closed circuit. This functionality is achieved through the orientation of the switch during installation.
Normally Closed Circuit
When configured for a normally closed circuit, the switch maintains a continuous connection until activated. The documentation depicts the retaining washer faces in the OPEN position and the terminals facing the LOCKED position to achieve this configuration.
Normally Open Circuit
Conversely, when configured for a normally open circuit, the switch does not establish a connection until activated. The documentation shows the retaining washer faces in the LOCKED position and the terminals facing the OPEN position for this configuration.
The documentation clarifies that the switch and label orientation remain consistent regardless of the bracket used; the bracket is reversed to accommodate the mounting differences between the KnoxBox 3200 and KnoxVault 4400. The switch itself can be rotated during installation to select the desired circuit behavior.
Technical Specifications and Limitations
The provided documentation specifies a maximum load capacity for the electrical switch: 28 Volt AC/DC at 5 Amps. It is important to adhere to this limitation to prevent damage to the switch or connected equipment. The documentation notes that devices requiring higher voltages may necessitate the use of an intermediate control relay. This relay would act as an intermediary, allowing the KnoxBox switch to trigger the relay, which in turn controls the higher voltage device.
Installation Considerations
The documentation stresses the importance of correct switch and label orientation during installation. The switch must be inserted into its mounting hole such that the label is readable and the circuit operates as intended. Proper orientation ensures that the selected normally open or normally closed configuration functions correctly.
Applications
The KnoxBox 3200/4400 electrical switch is primarily intended for unlocking electrical doors and gates controlled by low-voltage circuits. However, its application extends to other electrical equipment as well. The switch provides a means of remotely controlling access or power to these devices, enhancing security and convenience.
Mounting Bracket Orientation Differences
The documentation highlights a difference in mounting bracket orientation between the KnoxBox 3200 and KnoxVault 4400 systems. While the switch and label orientation remain constant, the bracket is reversed to accommodate the differing mounting structures. This ensures proper alignment and functionality within each system.
Retrofitting Existing Systems
The electrical switch is designed to be retrofitted into existing KnoxBox 3200 units sold since April 2002 and KnoxVault 4400 units sold since January 2003. This allows for upgrading older systems with the enhanced functionality of the electrical switch without requiring a complete system replacement.
Conclusion
The KnoxBox 3200 and KnoxVault 4400 electrical switch provides a versatile solution for controlling access to electrical equipment. Its compatibility with existing systems, configurable normally open/closed operation, and clear installation instructions make it a valuable component for security and access control applications. Adherence to the specified voltage and amperage limitations is crucial for safe and reliable operation. The switch’s ability to integrate with Maglock-type locks and other devices expands its utility across a range of security scenarios.