Overview
The TPK-40-DCxxx series is a Type 2/Class II surge protective device specially designed for low-voltage DC applications ranging from 24 VDC to 220 VDC. It provides full-mode surge protection for DC panels and circuits, covering +/−, +/PE, and −/PE paths. With a plug-in format and compact DIN-rail mounting, this SPD is ideal for use in industrial automation, data centers, telecommunications, UPS systems, and other sensitive DC-powered environments. Remote signaling is available for integration with monitoring systems.

Features
■ Suitable for 24V–220V DC systems (Uc = 24 / 48 / 65 / 85 / 150 / 220 VDC)
■ Discharge capacity: In 20 kA, Imax 40 kA (8/20 µs waveform)
■ Voltage protection level (Up): ≤ 0.2–0.9 kV depending on model
■ Ultra-fast response time: < 25 ns
■ Full-mode protection: +/−, +/PE, −/PE
■ Optional remote signaling (NO/NC, 3-pin)
■ Visual status indicator: Green (OK), Red (Replace)
■ Built-in thermal protection for fail-safe performance
■ Plug-in modular design with compact DIN-rail mounting (35 mm)
■ Housing: Flame-retardant PA66 (UL94 V-0), IP20 rating
■ Operating range: -40°C to +80°C; up to 4000 m altitude
■ IEC 61643-31 standard compliant