北部精機Northman壓力繼電器PS-35-1-20 70 150 230 420產品規格型號；中國臺灣北部精機Northman壓力繼電器（壓力開關）部分型號如下：
PS-35-1-20 PS-35-2-20 PS-70-1-20 PS-70-2-20
PS-150-1-20 PS-150-2-20 PS-230-1-20 PS-230-2-20
PS-420-1-20 PS-420-2-20 中國臺灣北部精機Northman疊加式壓力繼電器（壓力開關）部分型號如下：
MPS-02A-0-40 MPS-02A-1-40 MPS-02A-2-40 MPS-02A-3-40
MPS-02B-0-40 MPS-02B-1-40 MPS-02B-2-40 MPS-02B-3-40
MPS-02P-0-40 MPS-02P-1-40 MPS-02P-2-40 MPS-02P-3-40
MPS-02W-0-40 MPS-02W-1-40 MPS-02W-2-40 MPS-02W-3-40

MPS-03A-0-40 MPS-03A-1-40 MPS-03A-2-40 MPS-03A-3-40