NSYTR Warning label for screw terminal blocks, 4mm2, yellow. Series: Linergy - Product name: TR - Product or component type: Warning label - Device short name: TRA - Accessory/part category: Protective material - Product compatibility: TRV terminal block - flat plug separation terminal block, TRV terminal block - protective earthing terminal block, TRV terminal block - removable carrier separation terminal block, TRV terminal block - pass-through terminal block.