Single phase, 50/60 Hz : 110/120Vac, 208/220 Vac, 277 Vac (from the N to any phase of 480Vac Wye-Network)Three phase, 50/60 Hz : 208 Vac–Wye Network with Neutral, 240Vac–Delta Network, 408 Vac–Wye Network with NeutralSee below for the sketches
Used to Turn ON or Turns OFF any single or double or triple or 4 poles Electrical Contactors. The relay outputs from the
Micrometer are the 2 terminals labeled as 1 and 2 of J3. Terminals 1 and 2 are normally closed (NC) or shorted. Once the relay is
activated, it opens the terminals 1 and 2 as open connection.
The output switching (1, 2) can ONLY be connected to the Electrical Contactors coil’s terminal. The Contactor’s coil current and
voltage cannot exceed the specs below (in red dotted box in the photo below). See Q&A 3 to see some suggested suitable
Electrical Contactors. Note that the Micrometer is completely isolated from the Electrical Contactors load lines, and so this load
can be any value desired by the users. See sketch on Q&A 3.
0 amps to 50mA
J3 relay output is terminals 1 and 2. It is a ON/OFF switch. So, it has no outputs on its own or if nothing is connected to the
terminal. In default condition, electrical connection of terminals 1 to 2 are short circuited (ON/OFF switch in closed positi on).
When the J3 relay’s internal coil inside the Micrometer is activated, the electrical connection of terminals 1 to 2 opens (like a
ON/OFF switch opens) and there is infinite resistance between 1 and 2.
Any circuits connected to J3 relay outputs will be either switched ON (in default condition) or switched OFF (open circuit). The
user (external to the Micrometer) will connect a power source with the hot line of either a 24V, 110/220V, 208/230V and 240V to
terminals 2 and connects the return line to terminal 2. When the Micrometer internal replay coil is activated, the electrical
connections of terminals 1 to 2 is open, and no current flows.
This voltage cannot exceed 250V. See below for connection diagram on how the J3 relay outputs are connected in the intended
application. Note that the user select the suitable electrical contactors for this application.
Some recommended electrical contactors can be found in the below table.
 | Schneider Electric_TeSys-Deca-Contactors_LC1D32BD |
 | S3RH1140- 1BB709f07c0266f147f899ac32a 321efe26fd6a3491126d6e93e56f cd03d8a128a40 |
 | 27CAP |
 | TS_8910DPA34V02 |
 | 1SBC104032D0201 |
 | 3-4 pole 20-40 full page |
See attached in this email.
Yes. These are a signal connectors, firmware programming port to load the firmware into the microprocessor.
When we ship the Micrometer to the customer, this port on the enclosure will be covered with a UL
rated tape that can be removed in case this parts
needs to have its firmware updated.
