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• Only 18 mm wide
• Replaceable plug-in module
• Ideal for symmetrical connections such as RS485 or 232 with one pair of wires
• Choice of indirect or direct shielding
• Galvanically separated grounding via a gas discharge tube
• 2-stage protection
• Complies with the IEC 61643-21 standard
• Recommended for photovoltaic power plants with RS485
and wide-area systems
Technical data
| Description | FOR-12-IS | |
|---|---|---|
| Application | RS485, RS232 | |
| Rated voltage | Un | 12V |
| Max. perm. DC/AC operating voltage | Uc | 15V / 10V |
| Max. operating current** | IL | 2.4A |
| C3 Voltage protection level at In | Up | 30V** / <640V |
| C2 Rated discharge current In: 10 x 8/20µs |
In | 5kA |
| Limit leakage current Imax: 1 x 8/20µs |
Imax | 20kA |
| D1 Surge current Iimp: 2 x 10/350µs |
Iimp | 5kA |
| Impedance per line | R | 0 Ω |
| Capacity | C | <25pF |
| Activation time | <10 ns | |
| Device damaged | short circuit | |
| Mechanical Properties | |
|---|---|
| Configuration | DLA-IS = 1 double wire + shield + Signal-Ground |
| Mounting Method | TH35 mm mounting rail |
| Housing dimensions | See drawing |
| Cable cross-section | Min/max 0.4/1.5 mm² |
| Housing material | UL94-V0 thermoplastic |
| Grounding via | TH35 rail and screw terminal |
| Replacement module | DLAM-12-IS |
| Control Standards | |||
|---|---|---|---|
| IEC 61643-21 International | SPD for telecommunications and signaling networks | ||
| Article number | 640152 |
|---|---|
| Replacement module | 64015200 |
Dimensions and diagram

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P: 3-pole gas discharge tube |
Are you interested in this product? Do you need additional information or individual pricing?
• Only 18 mm wide
• Replaceable plug-in module
• Ideal for symmetrical connections such as RS485 or 232 with one pair of wires
• Choice of indirect or direct shielding
• Galvanically separated grounding via a gas discharge tube
• 2-stage protection
• Complies with the IEC 61643-21 standard
• Recommended for photovoltaic power plants with RS485
and wide-area systems
Technical data
| Description | FOR-12-IS | |
|---|---|---|
| Application | RS485, RS232 | |
| Rated voltage | Un | 12V |
| Max. perm. DC/AC operating voltage | Uc | 15V / 10V |
| Max. operating current** | IL | 2.4A |
| C3 Voltage protection level at In | Up | 30V** / <640V |
| C2 Rated discharge current In: 10 x 8/20µs |
In | 5kA |
| Limit leakage current Imax: 1 x 8/20µs |
Imax | 20kA |
| D1 Surge current Iimp: 2 x 10/350µs |
Iimp | 5kA |
| Impedance per line | R | 0 Ω |
| Capacity | C | <25pF |
| Activation time | <10 ns | |
| Device damaged | short circuit | |
| Mechanical Properties | |
|---|---|
| Configuration | DLA-IS = 1 double wire + shield + Signal-Ground |
| Mounting Method | TH35 mm mounting rail |
| Housing dimensions | See drawing |
| Cable cross-section | Min/max 0.4/1.5 mm² |
| Housing material | UL94-V0 thermoplastic |
| Grounding via | TH35 rail and screw terminal |
| Replacement module | DLAM-12-IS |
| Control Standards | |||
|---|---|---|---|
| IEC 61643-21 International | SPD for telecommunications and signaling networks | ||
| Article number | 640152 |
|---|---|
| Replacement module | 64015200 |
Dimensions and diagram

|
|
P: 3-pole gas discharge tube |
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