Surges and voltage transients are a major cause of equipment failure and system disruption. The TDS50 series surge protective devices, part of the ERITECH line of facility electrical protection products from ERICO, are designed to provide economical and reliable protection from voltage transients on solar PV systems.

They are conveniently packaged for easy installation on 35 mm DIN rail. Internal thermal disconnect devices help ensure safe behavior at end-of-life. A visual indicator flag provides user feedback in the event of such operation. As standard, the TDS50 provides a set of voltage-free contacts for remote signaling that maintenance is required. The convenient plug-in module and separate base design facilitates replacement of a failed surge module without needing to undo installation wiring.


Part NumberTDS502BR300DC
Nominal System Voltage (Un)300 VDC
Max Continuous Operating Voltage (Uc)350 VDC
Voltage Protection Rating (VPR)1,800.0 V @ 3 kA – to PE
1,800.0 V @ 3 kA + to PE
Nominal Discharge Current (In)20 kA 8/20 μs
Max Discharge Current (Imax)50 kA 8/20 μs
Frequency0 – 100 Hz
Protection Modes-ve to PE
+ve to PE
TechnologyGas Discharge Tube (GDT)
Metal Oxide Varistor (MOV)
Connection, Solid35 mm² Max
Connection, Stranded25 mm² Max
Mounting35 mm top hat DIN rail
Enclosure MaterialUL® 94V-0 Thermoplastic
Enclosure RatingIP 20
Remote ContactsYes
Status IndicationMechanical flag
Temperature-40 to 80 °C
Module Width2 M
Depth (D)68 mm
Height (H)90 mm
Width (W)35 mm
Unit Weight0.24 kg
Certification DetailsUL® 1449 Edition 3 for PV Applications
Complies WithANSI®/IEEE® C62.41.2-2002 Cat A, Cat B, Cat C
ANSI®/IEEE® C62.41.2-2002 Scenario II, Exposure 2, 50 kA 8/20 μs
Replacement ModuleTDS150M277
Standard Packaging Quantity1 pc