Eastron SDM120
Official manufacturer global verified Aug. 31, 2026
Eastron SDM120-M product page (the RS485 Modbus member of the SDM120 series)
Eastron SDM120-M product page
Identity
| category | smart_meters |
| ean | UNKNOWN |
| manufacturer | Eastron |
| market_version | 120 V or 230 V builds; MID-approved variants for EU |
| model | SDM120 |
| mpn | UNKNOWN |
| product_family | SDM120 series (DIN rail, single phase, 45A direct) |
| product_status | active |
| product_variants_documented | ['SDM120-Modbus', 'SDM120-Mbus', 'SDM120-Pulse', 'SDM120-M (2 pulse outputs + RS485 Modbus)', 'SDM120-MB (2 pulse outputs + M-Bus EN13757)', 'SDM120-P (2 pulse outputs only)', 'SDM120-A (analog display)'] |
| region | global |
| release_year | UNKNOWN |
| sku | UNKNOWN |
Electrical
| accuracy_active_power | +/-1% of range maximum |
| accuracy_class_documented | Class 1 per IEC 62053-21 / Class B per EN 50470-1/3 (datasheet and manual); SDM120-M product page additionally lists Class 0.5/1 IEC 62053-21 and Class C/B EN 50470-3:2022, reactive Class 2 IEC 62053-23 |
| accuracy_current | +/-0.5% |
| accuracy_frequency | +/-0.2% (SDM120-M product page) |
| accuracy_voltage | +/-0.5% |
| bidirectional_measurement | True |
| ct_ratio | N/A (direct-fed meter) |
| export_limitation_support | UNKNOWN |
| frequency_hz | 50 / 60 Hz (datasheet); '50/60Hz(+/-10%)' (user manual) |
| impulse_voltage_withstand | 6KV-1.2uS |
| max_current_a | 45 |
| max_current_imax_a | 45 |
| max_reading | 999999 kWh |
| measured_parameters | kWh, W, V, A, PF, Hz, demand (dmd) etc. (SDM120-M product page) |
| measurement_type | direct |
| minimum_current_a | 0.4% Ib-Imax (datasheet 'Operational current range'); 0.15 A (SDM120-M product page 'Minimum Current') |
| modbus_rtu | True |
| modbus_tcp | False |
| nominal_voltage | 120V or 230V ac (series datasheet); 230V (SDM120M user manual) |
| operational_voltage_range | 80%~120% of Un (series datasheet); 176~276V AC (SDM120M user manual); 85-276V AC (SDM120-M product page) |
| phase_type | single-phase |
| power_consumption | <= 2W/10VA (datasheet); '<2W/10VA' (manual) |
| pulse_output |
1000 imp/kWh (default); 2 pulse outputs; pulse width 200/100(default)/60 ms
Eastron SDM120 Series DIN Rail Mounted Single Phase 45A Datasheet — datasheet, 'Pulse output rate 1000imp/kWh', 'Pulse width 200/100(default)/60ms'
|
| pulse_output_count | 2 |
| rated_current_ib_a | 5 |
| rs485 | True |
| starting_current | 0.4% of Ib (SDM120M user manual); 20 mA (SDM120-M product page) |
| supported_inverter_brands_models | UNKNOWN |
Physical / mechanical
| depth_mm |
64
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, '18x118x64 (WxHxD) DIN 43880'
|
| din_module_width | 1 module, 18 mm (DIN 43880) |
| din_rail_type |
35 mm DIN rail ('Mounting DIN rail 35mm')
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, 'Mounting DIN rail 35mm'
|
| enclosure_material | UNKNOWN |
| height_mm |
118
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, '18x118x64 (WxHxD) DIN 43880'
|
| mounting_type | ['DIN-rail'] |
| shipping_weight_kg | UNKNOWN |
| terminal_locations |
Terminals 1/2: L-in/L-out; 3/4: N; 5/6/7: Pulse Output 2+ / COM / Pulse Output 1-; 8/9/10: GND / RS485 B- / RS485 A+
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, terminal table
|
| terminal_wire_range | UNKNOWN |
| torque_specs | UNKNOWN |
| weight_kg | UNKNOWN |
| width_mm |
18
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, '18x118x64 (WxHxD) DIN 43880'
|
Installation
| indoor_outdoor | indoor (IP51) |
| max_installation_altitude_m | 2000 |
Environment
| ip_rating | IP51 (indoor) |
| max_altitude_m | 2000 |
| operating_temperature_c | -25 to +55 |
| pollution_degree | UNKNOWN |
| relative_humidity | Operating <= 90% non-condensing (datasheet); '0 to 95%, non-condensing' (user manual) |
| storage_temperature_c | -40 to +70 |
Interfaces & connectors
| baud_rates | 1200/2400/4800/9600/19200 bps (series datasheet); 1200/2400/4800/9600 bps, default 2400 (SDM120M user manual); 2400-38400 bps (SDM120-M product page) |
| max_bus_length_m | 1000 |
| max_devices_per_bus |
64 pcs ('Max. Bus loading 64pcs')
Eastron SDM120 Series DIN Rail Mounted Single Phase 45A Datasheet — datasheet, 'Max. Bus loading 64pcs'
|
| mbus | M-Bus EN 13757-3 on SDM120-Mbus / SDM120-MB variant; address 1~250, 300-9600 bps |
| modbus_address_range | 1 to 247 (default 1) |
| modbus_rtu | yes - 'Protocol Modbus RTU' |
| modbus_tcp | no (not offered on this series in the fetched documents) |
| parity | NONE / EVEN / ODD |
| pulse_outputs | 2 |
| response_time | <100 ms (SDM120-M product page) |
| rs485 | yes - 'Bus type RS485(semi-duplex)' (SDM120-Modbus variant) |
| stop_bits | 1 or 2 (SDM120-M product page) |
Controls & display
| buttons | single front-panel button; press and hold 3 seconds to enter setup mode for Address, Baud Rate and Parity |
| display_type | LCD with white backlit |
| leds | UNKNOWN |
| local_display | True |
Protection
| overvoltage_category |
Installation category CAT II (SDM120M user manual)
Eastron SDM120M User Manual V2.9 (file eastronsdm120musermanualv2.9.pdf; search index lists the title string as 'Eastron SDM220M* User Manual' - the fetched content documents the single-phase SDM120M) — user manual, 'Installation Category CAT II'
|
| protection_class | UNKNOWN |
Certifications
| metrology | ['IEC 62053-21 (Class 1)', 'EN 50470-1', 'EN 50470-3 (Class B)', 'IEC 62053-23 (Class 2, reactive - SDM120-M page)', 'EN 50470-3:2022 (Class C/B - SDM120-M page)'] |
| mid_certificate_number |
0120 / SGS0141 (SDM120 series datasheet)
Eastron SDM120 Series DIN Rail Mounted Single Phase 45A Datasheet — datasheet, 'MID Certificate Number 0120 / SGS0141'
|
| other | [] |
| regional | ['CE', 'MID 2014/32/EU'] |
Warranty & service
| standard_years | UNKNOWN |
Documents
Recorded conflicts
interfaces.baud_rates Review required
1200/2400/4800/9600/19200 bps — SDM120 series datasheet
1200/2400/4800/9600 bps, default 2400 — SDM120M user manual V2.9
2400-38400 bps — SDM120-M product page
firmware/hardware revisions of the SDM120 family widened the supported baud range over time
certifications MID directive reference Review required
EU Directive 2014/32/EU (Measuring Instruments Directive) — Eastron SDM120 series datasheet
EU Directive 2014/34/EU — Eastron SDM120-M product page text
2014/34/EU is ATEX; the product page text appears to be a typographical error for the MID 2014/32/EU. Datasheet value retained.
starting_current Review required
0.4% of Ib (= 20 mA at Ib 5 A) — Eastron SDM120M user manual V2.9
20 mA, with minimum current 0.15 A — Eastron SDM120-M product page
same value expressed two ways; the product page separates start-up current from minimum measurable current
operational_voltage_range Review required
80%~120% of Un (i.e. 184-276 V at 230 V Un) — Eastron SDM120 series datasheet, fetched 2026-09-02
176~276V AC — Eastron SDM120M user manual V2.9, fetched 2026-09-02
85-276V AC — Eastron SDM120-M product page, fetched 2026-09-02
the wide 85-276 V figure is the meter's power-supply survival range on the current SDM120-M build, while the 80-120% Un figure is the metrologically valid measuring range; documents are of different vintages
interfaces.baud_rates Review required
1200/2400/4800/9600/19200 bps — SDM120 series datasheet
1200/2400/4800/9600 bps, default 2400 — SDM120M user manual V2.9
2400-38400 bps — SDM120-M product page
firmware/hardware revisions of the SDM120 family widened the supported baud range over time
certifications MID directive reference Review required
EU Directive 2014/32/EU (Measuring Instruments Directive) — Eastron SDM120 series datasheet
EU Directive 2014/34/EU — Eastron SDM120-M product page text
2014/34/EU is ATEX; the product page text appears to be a typographical error for the MID 2014/32/EU. Datasheet value retained.
starting_current Review required
0.4% of Ib (= 20 mA at Ib 5 A) — Eastron SDM120M user manual V2.9
20 mA, with minimum current 0.15 A — Eastron SDM120-M product page
same value expressed two ways; the product page separates start-up current from minimum measurable current
operational_voltage_range Review required
80%~120% of Un (i.e. 184-276 V at 230 V Un) — Eastron SDM120 series datasheet, fetched 2026-09-02
176~276V AC — Eastron SDM120M user manual V2.9, fetched 2026-09-02
85-276V AC — Eastron SDM120-M product page, fetched 2026-09-02
the wide 85-276 V figure is the meter's power-supply survival range on the current SDM120-M build, while the 80-120% Un figure is the metrologically valid measuring range; documents are of different vintages
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| Housing standard | DIN 43880 |
| Max reading | 999999 kWh |
| Response Time | <100 mS |