Type 2 AC Surge Protective Device

Type 1 SPDs are tested with a 10/350 μs lightning impulse current. Type 2 SPDs use an 8/20 μs discharge current waveform and limit transient overvoltages in AC distribution systems. Where the installation requires Type 1 protection, a Type 2 device alone does not replace it. See our Type 1 AC range or Type 1+2 AC range.

In is the nominal discharge current; Imax is the maximum discharge current. Both are stated with the 8/20 μs waveform for the Type 2 models shown here. Compare In with In and Imax with Imax, then check Uc, Up and the complete installation requirements. A higher Imax alone does not establish that a model is suitable.

Uc is the maximum continuous operating voltage. Select it for the voltage across the intended protection path and the earthing arrangement. Options vary by model; do not choose a rating solely from the supply’s line-to-line voltage. Ask THOR to confirm the complete specification of the required version.

Confirm the number of phases, conductor arrangement, earthing system and protection paths first. Pole count alone does not define the circuit: a 2P or 4P designation should not automatically be treated as a 1+1 or 3+1 configuration. Check the connection diagram for the selected product.

Ask for the remote signaling option, dimensions, connection diagram and technical data for the exact model and voltage version you intend to order. If a certificate or test report is required, specify the model, rating and document needed so that the applicable scope can be checked.

Send the model or required In / Imax, system voltage, earthing system, pole or circuit configuration, installation point and quantity. Include remote signaling, documentation and OEM requirements if applicable.