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This guide provides the detailed parts breakdown for the OTC Daihen VRTP400 III (S-3) argon arc welding machine. The symbols correspond to those in the VRTP400 parts configuration diagram (refer to the previous article). All items listed are genuine OTC Daihen spare parts, with model numbers, specifications, and quantities for easy identification and ordering.
| No. | Symbol | Part Name | Model / Part Number | Specification | Qty |
|---|---|---|---|---|---|
| 1 | T1 | Inverter transformer | P30112B00 | P30112B00 | 1 |
| 2 | T2 | Auxiliary transformer | QW-W00125 | QW-W00125 | 1 |
| 3 | T3 | Auxiliary transformer | QW-W00078 | QW-W00078 | 1 |
| 4 | DCL | DC reactor | P30112D00 | P30112D00 | 1 |
| 5 | LF1 | Filter board | 100-1954 | FS5681-33-99 (AP7681) | 1 |
| 6 | L2 | Toroidal core | 100-1950 | TW70W (R402715) | 1 |
| 7 | L3 | Toroidal core | 100-1950 | TW70W (R402715) | 1 |
| 8 | L4 | Toroidal core | 100-1950 | TW70W (R402715) | 1 |
| 9 | NF | Air switch | 100-0848 | DZ47-60 D40 400V | 1 |
| 10 | FM | Axial flow fan | 100-0933 | 200FZY3-S | 1 |
| 11 | — | Fan net | 100-0850 | QW-W00049 | 1 |
| 12 | CT2 | Current sensor | 100-0928 | HAS 400-S/SP50 | 1 |
| 13 | PL1 | Power indicator light | 4600-366 | N46010A7KW | 1 |
| 14 | PL2 | LED light | 4600-332 | DB-40-N-BR | 1 |
| 15 | THP1 | Temperature sensor | 100-1955 | KSD301-PH-125/3-NC | 1 |
| 16 | THP2 | Temperature sensor | 100-0895 | KSD870 250V-10A 85°C (TYPR A) | 1 |
| 17 | CC | Arc ignition coil | P30112C00 | P30112C00 | 1 |
| 18 | SOL | Solenoid valve | 100-0872 | 2CQ-20B-9 (DC 24V) | 1 |
| 19 | CON1 | External interface | 100-0864 | P20J11A (7 pins) | 1 |
| 20 | CON2 | External connection P | 100-0095 | DPC25-2BP-Z (25-2BD) | 1 |
| 21 | DM | Digital panel meter | 100-0852 | XL5135V-3 (AC 9V) | 1 |
| 22 | DR1 | Three‑phase rectifier bridge | 100-1393 | MDS75-16 | 1 |
| 23 | DR2~3 | Fast diode | 100-1951 | MMF150S060DK2B | 2 |
| 24 | TR1~2 | IGBT module | 100-1952 | MMG75SR120B | 2 |
| 25 | SW1 | Switch | 100-0853 | KCD18-11 (WI-OFF) | 1 |
| 26 | SW2 | Switch | 100-0854 | KCD18-13 (ON-OFF-ON) | 1 |
| 27 | SW3 | Switch | 100-0854 | KCD18-13 (ON-OFF-ON) | 1 |
| 28 | SW4 | Switch | 100-0854 | KCD18-13 (ON-OFF-ON) | 1 |
| 29 | SW5 | Switch | 100-1029 | KCD19-23 (MH)FF-ON | 1 |
| 30 | R1-4 | Varistor | 4516-119 | TDN14V-911KB0LLA0 | 4 |
| 31 | R5~8 | Carbon film resistor | 4508-015 | RD1/4W 1kΩJ | 4 |
| 32 | R9-10 | Cement resistor | 100-1217 | RX27N-4V 40W | 2 |
| 33 | R11 | Cement resistor | 100-0859 | RX27-4V 20W | 1 |
| 34 | R12 | Cement resistor | 100-1023 | RX27-4V 40W | 1 |
| 35 | R13 | Cement resistor | 100-0860 | RX27-4V 40W | 1 |
| 36 | — | Knob | 100-0874 | K-2195 S | 1 |
| 37 | — | Knob | QW-W00082 | QW-W00082 | 1 |
| 38 | R24~26 | Metal oxide film resistor | 4509-128 | RS2B 200kΩ | 3 |
| 39 | C1-2 | Film capacitor | 100-1953 | MFD-DA01 DC1200V-20µF | 2 |
| 40 | C4~5 | Film capacitor | 4518-533 | CBB80-2000V-473J | 2 |
| 41 | C7 | Ceramic capacitor | 4517-455 | 0.01µF 2kV | 1 |
| 42 | PS | Pressure switch | 4255-016 | W-W00032 | 1 |
| 43 | F1 | Fuse | 100-0862 | ZH217 (500V/5A) | 1 |
| 44 | — | Fuse holder | 100-0863 | QW-W00055(150) | 1 |
| 45 | PCB1 | Printed circuit board | P30247P | P30247P00 | 1 |
| 46 | PCB2 | Printed circuit board | P30067S | P30067S00 | 1 |
| 47 | PCB3 | Printed circuit board | P30067T | P30067T00 | 1 |
| 48 | PCB4 | Printed circuit board | P30067Y | P30067Y00 | 1 |
| 49 | PCB5 | Printed circuit board | P30067V | P30067V00 | 1 |
| 50 | PCB8 | Printed circuit board | P30112U | P30112U00 | 1 |
| 51 | ① | Input terminal block | K3904B00 | K3904B00 | 1 |
| 52 | ② | Input terminal cover | K3904C00 | K3904C00 | 1 |
| 53 | ③ | Cable clamp | 100-0866 | W-WQ0010 | 1 |
| 54 | ④ | Base metal (+) | K3927B00 | K3927B00 | 1 |
| 55 | ⑤ | Water‑cooled output terminal | QW-W00090 | QW-W00090 | 1 |
All parts listed above are 100% original OTC Daihen spare parts. Our company is an OTC-designated agent, ensuring you receive authentic components for your welding machine. Whether you need a single replacement or bulk orders, we are here to help.
📞 Contact Us for Orders / Inquiries
📱 Phone / WeChat / WhatsApp:
+86-180-9663-1656
📧 Email:
ahojotc@gmail.com
* For fastest response, please contact via phone or WhatsApp. You're also welcome to connect on WeChat to exchange knowledge and information about OTC welding machines.
Company: COMPANY：Authorized Distributor of OTC Daihen
Contact person: Contact：Mr.Fang
Mobile phone: Phone：+86-18096631656
Email address: Email：15305667776@163.com
Address: Add：Room 11-704, K Xijia, No. 502, Wangjiang West Road, Hefei, Anhui, China