Ditek DTK-TSS4D Surge Protective Device 120V 40ka Nema 4

Product Description

The DITEK DTK-TSS4D is a series-mode surge protective device rated for 120 volts and 40 kA, housed in a NEMA 4 enclosure for use in demanding environments. It is designed to protect fire alarm and life-safety systems from transient voltage surges and electrical interference that can damage sensitive control equipment. Licensed electricians and fire alarm technicians install this device in line with protected circuits to divert surge energy before it reaches downstream components. The NEMA 4 enclosure provides resistance to dust and water ingress, making it suitable for indoor and outdoor installation points.

This surge protective device is applied in fire alarm system installations where circuit protection is required at the panel, field device loop, or power input stage. It is appropriate for use in commercial and light industrial environments where electrical transients from nearby switching loads, lightning events, or utility disturbances pose a risk to fire detection and notification equipment. Installation typically occurs at the power supply input or signal line entry point of a fire alarm control panel.

Key Features

• 120-volt rated for compatibility with standard single-phase AC supply circuits
• 40 kA surge current capacity for robust transient protection
• Series-mode design targets surge energy directly in the conduction path
• NEMA 4 enclosure provides protection against dust, splashing water, and windblown debris
• Intended for fire surge protection category applications

Compatibility

Designed as an OEM-style surge protective device for fire alarm and life-safety system power and signal circuits requiring 120-volt, series-mode protection in a NEMA 4 rated enclosure.

Installation Notes

Installation should be performed by a licensed electrician or certified fire alarm technician in accordance with NFPA 72, NEC Article 285, and applicable local codes. De-energize the circuit completely before making any wiring connections to the device. Follow the manufacturer data sheet for correct series wiring orientation, as improper installation can defeat surge protection. Verify enclosure sealing integrity after installation to maintain the NEMA 4 rating.