| Subject | English | Japanese |
| PSP | non-polarized relay | 無極リレー |
| el., meas.inst. | polarized AC relay | 極性量を使った継電器 |
| el., meas.inst. | polarized DC relay | 有極リレー |
| PSP | polarized elementary relay | 有極リレー |
| PSP | polarized elementary relay | エレメンタリー有極リレー |
| phys. | polarized relay | 有極継電器 (yūkyoku-keidenki) |