Devices and Modules

ElectroBoard supports 29 types of modular devices, split into 7 groups. Each device has its own parameters, connection rules and visual representation (colour theme).

Device info tooltip#

In the palette, next to each device name there is an ⓘ icon. Hover over it (or tap on mobile) — a short reference appears: what the device is, what it is used for, and what each of its parameters means.

Compact form factor#

Some manufacturers make 1-module variants of normally wider devices. In the connection panel there is a "Form factor" → "Compact" toggle for 14 types:

Type	Variant	Standard	Compact	Example model
MCB	1P+N	2M	1M	Hager MLN, Schneider iDPN
RCBO	1P+N	2M	1M	ETI KZS-1M, Hager MLN940
AFDD	1P+N	2M	1M	Hager ARM920U, Schneider iCV40H
Isolator	1P+N	3M	1M	ETI SV-440
SPD	1P+N	2M	1M	Hager SPN240R, ABB OVR T2
Contactor	2P	2M	1M	ETI R 20-20, Hager ESC125, Finder 22.32
Contactor	4P	3M	2M	ETI R 25-22
Voltage relay	1P+N	2M	1M	Novatek RN-118, DigiTOP V-protector
Time relay	1P/2P	2M	1M	Finder 82 Series
LED power supply	1P+N	3M	1M	Mean Well HDR-15
DC power supply	1P+N	2M	1M	Mean Well HDR-15
Schuko socket	1P+N	2M	1M	ABB N2071, Hager SK62, Schneider Resi9
Smart controller	1P+N	2M	1M	Shelly Pro 1PM
Dimmer	1P	2M	1M	Shelly Pro Dimmer 1PM

The toggle appears automatically when the current connection variant supports the compact form factor.

💡 Extended width: separately from the compact variants, a 1P+N RCBO supports a width of up to 4 modules (ETI KZS-2M 3.5–4M slim — Type B / 10 kA / 125 A). The width selector is in the properties panel → "Modules".

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Protection#

Devices that protect circuits from overload, short circuit, earth-leakage current and other fault conditions.

MCB — Miniature Circuit Breaker#

The most common device in a panel. Protects a circuit from overload and short circuit.

• Default rating: 16 A
• Modules on the DIN rail: 1 (for 1P)
• Characteristic (trip curve): B, C or D
  • B — for lighting and cable runs without high inrush currents
  • C — universal, suitable for most domestic loads (sockets, appliances)
  • D — for motors and equipment with high inrush currents
• Breaking capacity: 3, 6 or 10 kA
• Connection variants: 1P, 1P+N, 2P, 3P, 3P+N
• Compact 1P+N: 1 module instead of 2 (Hager MLN, Schneider iDPN) — enable the checkbox in the parameters
• 2P mode: for the 2P variant a "2P mode" toggle is available in the properties panel:
  • L + N — protection of both poles of a single-phase supply (typical for the residential sector)
  • L1 + L2 — two phases without neutral (a split-phase inverter/generator branch)
  • The default is chosen automatically: if an ancestor in the supply chain is a source of type inverter/generator/solar/battery without a neutral — L1+L2 is chosen, otherwise L+N
• Can be a child — yes (connects to an RCD, isolator or another MCB)
• Has an outgoing cable — yes

💡 The same "2P mode" rule applies to: the fuse, contactor, time relay and isolator. The changeover switch 1-0-2 has its own logic — in 2P mode it is always L+N.

RCCB (RCD) — Residual-Current Circuit Breaker#

Protects against electric shock and fire caused by leakage. An RCD does not protect against short circuit — so it is usually installed after an MCB.

• Default rating: 40 A
• Modules: 2
• RCD type: AC (standard), A (for electronics), B (for variable-frequency drives)
• Tripping current: 10, 30, 100 or 300 mA
  • 30 mA — shock protection (for domestic circuits)
  • 10 mA — enhanced protection (bathroom)
  • 100–300 mA — fire protection (at the incomer)
• Connection variants: 2P, 4P
• Can be a parent — yes (group MCBs connect under it)
• Has a "Test" button — yes

⚠️ Warning: an RCD must always be protected by an MCB upstream. The validation system warns you if an RCD has no short-circuit protection — the check walks the entire ancestor chain through non-protection devices (voltage relay, contactor, transfer switch); finding an MCB/RCBO/fuse at any level upstream is enough.

💡 Automatic N bar: the RCD, RCBO, ATS and changeover switch 1-0-2 get their own N bar automatically — when the first child moves to "via bar" neutral routing. As long as no child uses the bar, it is not created; when all children move back to "direct", the bar is removed. The first N child defaults to "direct", the second and later ones to "via bar".

RCBO — Residual-Current Breaker with Overcurrent Protection#

A combined device: MCB + RCD in one housing. Protects both against overload/short circuit and against leakage.

• Default rating: 16 A
• Modules: 2 (standard). For 1P+N a width of up to 4 modules is available — ETI KZS-2M 3.5–4M slim (Type B / 10 kA / 125 A)
• Compact 1P+N: 1 module (ETI KZS-1M) — via the "Compact" checkbox
• Characteristic: B, C or D
• RCD type: AC, A or B
• Tripping current: 10, 30, 100 or 300 mA
• Connection variants: 1P+N, 3P+N
• Has a "Test" button — yes
• Has an outgoing cable — yes

💡 Tip: an RCBO is handy when you need individual leakage protection on a specific circuit (e.g. a washing machine, a water heater). It takes less space than an "MCB + RCD" pair, but costs more.

AFDD — Arc-Fault Detection Device#

Detects and disconnects dangerous electrical arcs in the wiring that can cause a fire.

• Default rating: 16 A
• Modules: 2
• Connection variants: 1P, 1P+N
• Compact 1P+N: 1 module (Hager ARM920U, Schneider iCV40H)
• Has an outgoing cable — yes

SPD — Surge Protective Device#

Protects against transient overvoltages (lightning, switching surges in the network).

• Rating: 0 A (has no operating-current rating)
• Modules: 2
• SPD class: I, II or III (II by default)
• Discharge current: set in kA (20 kA by default)
• Connection variants: 1P+N, 3P+N

N behaviour (shunt). An SPD has a varistor shunt to earth — physically one N contact, and it does not pass operating current to the output. The children of an SPD always take the neutral from the N bar (not directly from the SPD). So the SPD panel has no "Direct / Bar" toggle — there is no choice. The "group N bar" field is disabled for an SPD: it cannot own a bar.

PE terminal. On the output side the SPD renders a separate green PE terminal — to the right of the active poles (1P+N → terminal at position 3, 3P+N → at position 5). The N terminal (blue) stays only on the input; the output has PE only. This removes the visual overlap of the PE conductor with the N conductor.

Fuse#

A fuse — a single-use protective element against short circuit and overload.

• Default rating: 16 A
• Modules: 1
• Fuse-link type: gG (general purpose), aM (motor protection) or gR (semiconductor protection)
• Connection variants: 1P, 2P, 3P
• Has an outgoing cable — yes

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Switching#

Devices for switching electrical circuits on/off and transferring between them.

Isolator (QS)#

A switch-disconnector for manual switching on/off. Usually used as the incoming device at the start of a panel.

• Default rating: 63 A
• Modules: 3
• Connection variants: 1P, 1P+N, 2P, 3P, 4P
• Compact 1P+N: 1 module (ETI SV-440)
• Can be a parent — yes
• Can be a child — yes; usually the incoming device, but it can also sit downstream as a section isolator

Contactor (KM)#

An electromagnetic switch for remote control of high-power loads (lighting, heating, ventilation).

• Default rating: 40 A
• Modules: 2P → 2M, 3P → 3M, 4P → 3M
• Contact configuration: NO (normally open), NC (normally closed), NO+NC
• Connection variants: 2P, 3P, 4P
• Control circuit: the contactor has A1/A2 terminals (the coil). A contactor control switch or time relay connects to A1; A2 is joined to the N bar. Control-circuit wires are drawn as a dashed line
• Can be both a parent and a child

Contactor control switch (SW)#

A module for manual control of a contactor. Connects to the A1/A2 terminals of the contactor coil.

• Modules: 1
• Connection: 1P
• Switch type: manual or auto
• "Control" section: in the properties panel you choose the contactor this switch controls
• Control is also supported by: time relay, voltage relay, multi-function relay, smart controller

ATS — Automatic Transfer Switch#

An automatic switch between the main and reserve power source.

• Default rating: 63 A
• Modules: 4
• Number of sources: 2 (main + reserve)
• Connection variants: 2P, 4P
• Modes:
  • Automatic (ATS) — switches to reserve when the main supply fails. The switching time is set in seconds (5 s by default)
  • Manual (1-0-2) — a switch with three positions

More about dual connection and modes — in the Hierarchy → ATS section.

Input cables for the ATS / changeover switch 1-0-2: two separate cable fields are provided — main and reserve (from a generator or UPS). Both appear in the "Input cables" section of the properties panel and in the BOM. Validation checks each cable independently per IEC 60947-6-1.

4P N bar of the ATS / changeover switch 1-0-2: when a 4P ATS or changeover switch 1-0-2 is connected, the system automatically creates a separate N bar — the same as for an RCD. This meets the requirements of IEC 60947-3 for TN-C-S systems, where the neutral must be switched together with the phases. Bar label: "N (ATS)".

Changeover switch 1-0-2 (QC)#

A manual switch between two power sources. Like an ATS but without automatic voltage monitoring. Three positions: source 1 — off — source 2. The variant model per IEC 60947-3 matches real products (Hager SFT, ABB OTM, Socomec SIRCO).

• Default rating: 40 A (Hager SFT440)
• Modules: 1P → 1M (SFT140), 2P → 2M (SFT240), 3P → 3M, 4P → 4M (SFT440)
• Connection variants: 1P, 2P, 3P, 4P
• N switching:
  • 1P — a single phase without neutral (a cottage with a generator)
  • 2P — L+N (a single-phase panel with an inverter/generator, SFT240-style). In a domestic scheme the switch output is always L+N regardless of the inverter type on the reserve input
  • 3P — 3L without neutral (TN-C, a 4-wire network)
  • 4P — 3L + N, the neutral is switched together with the phases (TN-C-S / TN-S / TT — mandatory for TT/IT per IEC 60364-4-41)
• Number of sources: 2 (main + reserve — the same as an ATS)
• Can be both a parent and a child

Phase selector (FK)#

Lets you pick one of three phases to supply single-phase loads. Three-phase input (L1+L2+L3), single-phase output (the selected phase).

• Default rating: 32 A
• Modules: 3
• Connection variants: 3P (only)
• "Output phase" parameter: L1, L2 or L3 — determines which phase the child devices receive
• Cascade update: when the output phase changes, all child devices automatically move to the new phase
• Can be both a parent and a child
• SVG: 3 input terminals at the top, 1 output terminal at the bottom centre
• Use case: balancing the load across phases — each phase selector routes out one specific phase

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Monitoring#

Devices for monitoring the parameters of the electrical network.

Voltage relay (RV)#

Disconnects the load when the voltage goes outside the permissible limits (too high or too low).

• Default rating: 63 A
• Modules: 2
• Parameters: minimum voltage (170 V), maximum (270 V), reconnect delay (5 s)
• Display: built-in (by default)
• Connection: 1P+N, 3P+N
• Compact 1P+N: 1 module (Novatek RN-118)

Time relay (RT)#

A timer for automatic control of loads on a schedule.

• Default rating: 16 A
• Modules: 2
• Mode: cyclic, delay or astronomical
• Number of channels: 1 and more
• Connection: 1P, 2P

Current relay (RI)#

Monitors the current in a circuit and disconnects it when a set threshold is exceeded.

• Default rating: 63 A
• Modules: 2
• Current range: set in A
• Connection: 1P

Phase-sequence relay (RPF)#

Monitors the presence, order and symmetry of the phases in a three-phase network.

• Modules: 2
• Monitoring type: sequence, phase loss or asymmetry
• Connection: 3P, 4P

Multi-function relay (RMF)#

A combined monitoring and protection device: voltage monitoring, current limiting and a timer in one module. Replaces a separate voltage relay + time relay.

• Default rating: 63 A
• Modules: 3
• Connection: 1P+N, 3P+N
• Can be a parent — yes
• Contactor control — yes ("Control" section)

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Metering#

Energy meter (kWh)#

An electricity meter for consumption metering.

• Modules: 4
• Type: single-phase or three-phase
• Interface: none, RS485 or Modbus
• Connection: 1P+N, 3P+N

Indicator (IND)#

An indicator lamp or LED for visual indication of the presence of voltage. The three-phase version (Schneider iIL) shows the presence of each phase separately.

• Modules: 1P → 1M, 3P → 1M (one module for three phases)
• Connection: 1P, 3P

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Power supply#

LED power supply#

A voltage converter for LED lighting.

• Modules: 3
• Output voltage: 12, 24 or 48 V
• Output power: set in W (60 W by default)
• Connection: 1P+N
• Compact 1P+N: 1 module (Mean Well HDR-15)

DC power supply#

A converter for supplying DC devices (controllers, automation).

• Modules: 2
• Output voltage: set in V (24 V by default)
• Output current: set in A (10 A by default)
• Connection: 1P+N

Distribution block (cross-module) (KM)#

Branches the supply from a single input to several outgoing circuits. Each bar is an isolated conductor. Installed after the incoming breaker to distribute the phases.

• Modules: 4
• Rated current: the maximum continuous current through one bar (100 A by default)
• Outputs per pole: 5, 7, 11, 12, 15 or 16 — determines how many circuits can be connected
• Max input conductor: 10, 16, 25 or 35 mm²
• Max output conductor: 2.5, 4, 6 or 10 mm²
• Connection: 1P, 1P+N, 2P, 4P
• Can be a parent — yes (connected circuits become children)
• Can be a child — yes (connects to the incoming device)
• Validation: checks the maximum number of connections per pole and phase compatibility

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Infrastructure#

Schuko socket (XS) — DIN-rail#

A Schuko socket (Type F) on the DIN rail — a typical use case in a boiler room, a service corridor, a garage or a server room. Lets you plug appliances in directly at the panel without running a separate circuit.

• Rated current: 16 A (typical domestic) — 10 A (low-power) and 20 A (high-power loads) are also available
• Modules: 2 (standard) — a 1-module compact variant (ABB N2071, Hager SK62, Schneider Resi9)
• Connection: 1P+N (line + neutral + PE from the Schuko side clips)
• Has earthing: yes — Schuko has a PE contact (the side clips) and requires a connected PE
• Can be a child — yes (connects to a breaker or an RCBO)
• Cannot be a parent — it is a final load
• SVG: a realistic DIN-rail socket visual with a face plate, pin holes and earthing clips

⚠️ Protection: like any load, a socket must be protected by a breaker (typically 16 A, characteristic C) + preferably an RCBO, or downstream of an RCD, for leakage protection (IEC 60364-7-701 — mandatory for wet locations).

Terminal block (XT)#

An element for joining conductors. Has no electrical parameters.

• Modules: 1
• Connection: 1P

Smart-home controller (SC)#

A modular controller for smart-home systems.

• Modules: 2
• Protocol: Wi-Fi, Zigbee or Z-Wave
• Number of channels: 8 and more
• Connection: 1P+N
• Compact 1P+N: 1 module (Shelly Pro 1PM)

Dimmer (DIM)#

A brightness controller for lighting.

• Modules: 2
• Maximum power: set in W (400 W by default)
• Type: Leading edge, Trailing edge or Universal
• Connection: 1P, 1P+N
• Compact 1P: 1 module (Shelly Pro Dimmer 1PM)
• Has an outgoing cable — yes

Bell (BEL)#

A bell or siren for signalling.

• Modules: 1
• Connection: 1P

Blank plate#

A blank filler for unused positions on the DIN rail. A purely organisational element — it has no electrical connections, poles or wiring.

• Modules: 1
• Connection: none

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Custom#

Custom component#

If the device you need is not in the list — create a custom one. You can set your own type name and an icon (emoji).

• Modules: 1 (can be changed)
• Type name: free text
• Icon: any emoji
• Connection: 1P, 1P+N, 2P, 3P, 3P+N, 4P — all variants available
• Compact 1P / 1P+N: 1 module

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Connection variants (poles)#

Each device supports one or more connection variants:

Variant	Poles	Conductors	Use case
1P	1	L	Single-phase load without neutral
1P+N	2	L + N	Single-phase load with neutral
2P	2	L + N	Single-phase load (RCD, isolator)
3P	3	L1 + L2 + L3	Three-phase load without neutral
3P+N	4	L1 + L2 + L3 + N	Three-phase load with neutral
4P	4	L1 + L2 + L3 + N	Three-phase with neutral (RCD, isolator)

The connection variant determines how many modules the device occupies on the rail and which conductors are drawn on the schematic.

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Skin themes (colours)#

Each device type has its own colour for easy visual distinction on the schematic. There are 19 colour themes in total. For example:

• MCB — blue
• RCD — violet
• RCBO — indigo
• Isolator — slate
• SPD — amber
• Contactor — orange

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Room zone#

Each device can be assigned a room zone — this indicates which room the circuit belongs to. The field is in the properties panel, in the "Advanced" section (a dropdown).

11 zones are available:

Zone	Icon
Kitchen	🍳
Bathroom	🚿
Bedroom	🛏️
Living room	🛋️
Corridor	🚪
Balcony	🌿
Garage	🚗
Boiler room	🔥
Outdoor	🌳
Laundry	🧺
General	🏠

The chosen zone is shown as an icon (emoji) on the breaker's SVG right on the panel schematic — this lets you quickly identify the purpose of each circuit visually.

Zones are used for validation: for example, devices in wet zones (bathroom, laundry) are automatically checked for an RCD with IΔn ≤ 30 mA (IEC 60364-7-701).