Over 800,000 products available
RS Better World

Siemens Monitoring Relay, 3 Phase, SPDT, DIN Rail, 5mA to 5A, 160 V, 160V ac, 690 V ac

View all Monitoring Relays

Subtotal (1 unit)*

£95.15

(exc. VAT)

£114.18

(inc. VAT)

Add to Basket
Select or type quantity
In Stock
  • 2 unit(s) ready to ship from another location
  • Plus 2 unit(s) shipping from 03 June 2026
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units
Per unit
1 +£95.15

*price indicative

Better World

Our Better World range features products that make it easy for you to make a greener product choice you can trust. Click here to find out more.

RS Stock No.:
149-139
Mfr. Part No.:
3UG5511-1AR20
Brand:
Siemens
Find similar products by selecting one or more attributes.
Select all

Brand

Siemens

Product Type

Monitoring Relay

Electrical Phase

3

Contact Configuration

SPDT

Mount Type

DIN Rail

Minimum Current Sensed

5mA

Maximum Current Sensed

5A

Power Consumption

1.8W

Terminal Type

Screw

Time Delay

20 ms

IP Rating

IP20

Relay Contact Current

5A

Supply AC Voltage

160, 690V ac

Supply DC Voltage

160 V

Minimum Operating Temperature

-25°C

Maximum Operating Temperature

60°C

Width

22.5mm

Height

100mm

Standards/Approvals

No

Length

90mm

Better World Product

Yes

Better World Claim

Concentrated or Compact Solution

COO (Country of Origin):
DE

Siemens Monitoring Relay, 5A Maximum Current Sensed, 160/690V AC Supply Voltage - 3UG5511-1AR20


This monitoring relay monitors three-phase supply sequence and voltage within industrial control panels. It detects phase order and provides a single changeover contact for control logic, operating on AC supplies across a wide voltage band and tolerating typical industrial disturbance levels. The unit is intended for DIN-rail mounting where compact, rugged line supervision is required.

Features & Benefits


• Monitors 3-phase sequence and prevents incorrect rotation
• SPDT contact rated for practical switching up to 5A
• Wide AC sensing range 160–690 V for flexible supply conditions
• Galvanic isolation between input and outputs for safer circuits

**Applications**


• Suitable for protecting motor starters from phase reversal
• Ideal for integration into machine control panels
• Used with contactors in three-phase distribution systems
• Can be used for line supervision in manufacturing plants

What control supply frequencies are supported?


It accepts AC control supplies at both 50 Hz and 60 Hz within the specified operating range factors of 0.85 to 1.1.

How does it behave during short interruptions?


The device provides a minimum buffering time of 20ms to bridge brief supply disturbances before tripping.

What connection options are available for field wiring?


Screw terminals accept solid or finely stranded conductors from 0.5 mm2 up to 4 mm2 with a stripping length of 10 mm and 0.6–0.8 N·m tightening torque.

What environmental limits must be observed during installation?


It operates between -25 °C and +60 °C, with a maximum recommended installation altitude of 2000m and up to 70% relative humidity during use.

How is mechanical mounting achieved?


It mounts on a 35mm DIN rail and includes removable terminals for both main and auxiliary circuits for simplified wiring and maintenance.

Related links