TPM7n Series DC Molded Case Circuit Breaker (63–800A, 1500V DC)
Engineered to align with IEC 60947-2. Component certificates are held by TYPLE's qualified supply-chain partners and can be provided on request.
- 63–800 A across two frame sizes — TPM7n-320 and TPM7n-800
- Up to 1500 V DC, within the IEC low-voltage range (≤ 1500 V DC)
- Icu = Ics = 20 kA — full service breaking capacity after an ultimate short circuit
- 2P and 3P configurations, screw-fixed or plug-in, with optional alarm contact, shunt release and undervoltage release
Product Overview
A TPM7n DC molded case circuit breaker is rated 63–800 A and up to 1500 V DC, with an ultimate and service breaking capacity of 20 kA (Icu = Ics) and a thermal-magnetic trip unit. At 1500 V DC it remains within the IEC low-voltage range, so no high-voltage switchgear qualification is required to specify or install it.
Two frame sizes cover the 63–800 A band: the TPM7n-320 frame (63 to 320 A, in 2P and 3P) and the TPM7n-800 frame (400 to 800 A, in 2P only).
The TPM7n differs from the TPM7 in two ways that matter at system level. First, insulation per pole is higher: a TPM7n-320 pole withstands 500 V DC, so 2P reaches DC 1000 V and 3P reaches 1500 V DC, while a TPM7n-800 pole withstands 750 V DC and reaches 1500 V DC with only two poles. Second, service breaking capacity equals ultimate breaking capacity — Ics = Icu = 20 kA — so the breaker can be returned to normal service after interrupting a maximum-level fault, where the TPM7 recovers to 15 kA against an Icu of 20 kA.
Typical positions are the outgoing side of an array combiner cabinet, the DC input of a central or string inverter, and main feeders in DC distribution cabinets on utility-scale plants.
For systems at DC 1000 V and below, or for currents up to 250 A, the more compact TPM7 series DC MCCB is normally the better choice.
TPM7n Technical Specifications
The TPM7n covers 63–800 A across two frame sizes: the TPM7n-320 (63–320 A, 2P or 3P) and the TPM7n-800 (400–800 A, 2P). Each TPM7n-320 pole withstands 500 V DC and each TPM7n-800 pole withstands 750 V DC; both frames carry a rated insulation voltage of 1600 V, Icu = Ics = 20 kA, and are engineered to align with IEC 60947-2.
Frame sizes, rated currents and pole options
| Frame | Rated current In (A) | Poles | Ue (DC) | V per pole |
|---|---|---|---|---|
| TPM7n-320 | 63 / 100 / 125 / 160 / 180 / 200 / 225 / 250 / 300 / 320 | 2P | 1000 V | 500 V |
| TPM7n-320 | 63 / 100 / 125 / 160 / 180 / 200 / 225 / 250 / 300 / 320 | 3P | 1500 V | 500 V |
| TPM7n-800 | 400 / 450 / 500 / 630 / 700 / 800 | 2P | 1500 V | 750 V |
How many poles does a DC Molded Case Circuit Breaker need?
Electrical data
| Parameter | TPM7n-320 | TPM7n-800 |
|---|---|---|
| Rated operational voltage Ue (DC) | 1000 V (2P) / 1500 V (3P) | 1500 V (2P) |
| Rated insulation voltage Ui | 1600 V | 1600 V |
| Rated impulse withstand voltage Uimp | 8 kV | 12 kV |
| Rated ultimate breaking capacity Icu | 20 kA | 20 kA |
| Rated service breaking capacity Ics | 20 kA | 20 kA |
| Trip unit | Thermal-magnetic | Thermal-magnetic |
| Mechanical life | 20,000 operations | 20,000 operations |
| Electrical life | 3,000 operations | 3,000 operations |
| Housing material | Bakelite (thermoset) | Bakelite (thermoset) |
| Conductor material | Copper | Copper |
| Operating temperature | −35 °C to +70 °C | −35 °C to +70 °C |
| Relative humidity | ≤ 95 % | ≤ 95 % |
| Altitude | ≤ 2000 m | ≤ 2000 m |
| Installation | Screw-fixed or plug-in | Screw-fixed or plug-in |
| Accessories | Alarm contact, shunt release, undervoltage release | Alarm contact, shunt release, undervoltage release |
| Reference Standards | IEC 60947-2 | IEC 60947-2 |
Mounting note: the fixed version is screw-fixed to a base plate. TPM7n frames are not DIN-rail mounted.
Dimensions (L × W × H, mm)
| Frame | 2P | 3P |
|---|---|---|
| TPM7n-320 | 180 × 76 × 126 | 180 × 107 × 126 |
| TPM7n-800 | 250 × 124 × 165 | — |
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How to Select the Right Frame and Pole Configuration
A 1500 V DC array is protected by a 3-pole TPM7n-320 up to 320 A, or by a 2-pole TPM7n-800 from 400 A to 800 A.A TPM7n-320 pole withstands 500 V DC and a TPM7n-800 pole withstands 750 V DC, so the frame is selected from the rated current and the pole count follows from the system voltage.
| System DC voltage | 63–320 A | 400–800 A |
|---|---|---|
| DC 1000 V | TPM7n-320, 2P |
TPM7n-800, 2P |
| 1500 V DC | TPM7n-320, 3P |
TPM7n-800, 2P |
| DC 750 V and below | use TPM7-125 / TPM7-250 |
TPM7n-800, 2P |
Three practical notes:
- At DC 1000 V, a 2P TPM7n-320 replaces a 4P TPM7.
Both are rated for the same system voltage, but the TPM7n uses half the poles — 76 mm of panel width instead of 121 mm. - The TPM7n-800 reaches 1500 V DC with two poles
, because each pole withstands 750 V DC. No 3P version is offered on this frame. - 1500 V DC is still low voltage
under IEC definitions (≤ 1500 V DC). No high-voltage switchgear qualification is required to specify or install these breakers.
Applications
The TPM7n protects DC circuits from 63 A to 800 A at system voltages up to 1500 V DC — most often in array combiner cabinets, at the DC input of central and string inverters, and on main feeders in DC distribution cabinets.
- Utility-scale PV array combiner cabinets — outgoing protection for combined string currents of 400–800 A on 1500 V DC arrays, downstream of string-level PV combiner boxes.
- Inverter DC input protection — isolating and protecting the DC feed into central or string inverters.
- DC distribution cabinets — main and sub-feeder breakers in 1000 V and 1500 V DC panels.
- Large commercial and industrial rooftop PV — where array current exceeds the 250 A ceiling of the TPM7 frames.
- DC side of energy storage systems — protection between battery banks and the power conversion system on high-current DC buses.
DC MCCB OEM & Customization
TYPLE builds TPM7n DC molded case circuit breakers to order, with rated current, 2P or 3P pole configuration, mounting type and accessory fitment selected per project. TYPLE is a Wenzhou-based manufacturer of PV combiner boxes and DC protection components for solar and energy storage systems.
OEM and ODM options cover selection of rated current within each frame, accessory fitment (alarm contact, shunt release, undervoltage release), plug-in or screw-fixed mounting, and nameplate or packaging branding. Backed by the Liushi low-voltage electrical supply hub, we deliver customized solutions with short lead times, confirmed in writing at quotation.
TPM7n breakers are engineered to align with IEC 60947-2. Certificates for the breaker are held by TYPLE’s qualified supply-chain partners and can be provided on request with written attribution.
FAQs
1500 V DC. On the TPM7n-320 frame, a 2P breaker is rated for DC 1000 V and a 3P breaker for 1500 V DC. On the TPM7n-800 frame, each pole withstands 750 V DC, so a 2P breaker reaches 1500 V DC.
No. Under IEC definitions, direct current up to 1500 V remains within the low-voltage range. A 1500 V DC array is a low-voltage DC system and is protected with low-voltage devices such as the TPM7n.
Ics is the fault current after which a breaker can return to normal service; Icu is the maximum it can interrupt at all. On the TPM7n both are 20 kA, so the breaker remains serviceable after clearing a maximum-level short circuit. On the TPM7 series, Ics is 15 kA against an Icu of 20 kA.
Usually not. String-level PV combiner boxes carry 63–250 A and are better served by the TPM7 frames, or by a DC MCB such as the TPB7-63. The TPM7n is sized for array combiner cabinets and DC distribution cabinets, where combined currents reach 320–800 A.
No. The TPM7n-320 is offered in 2P and 3P; the TPM7n-800 is offered in 2P only. Higher insulation per pole is what allows the TPM7n to reach 1500 V DC without a fourth pole.
Yes. Both frames are available screw-fixed to a base plate or in a plug-in version. Plug-in mounting shortens replacement time in cabinets where downtime is costly. TPM7n frames are not DIN-rail mounted.
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