Safety Relays

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MSI-SR1 Safety-Relays Category 3

The safety relay MSI-SR1 is an Emergency Stop switching device and safety door monitor for protecting people from dangerous production processes in accordance with EN 60204-1 Stop 0, and EN 954-1 up to Cat. 3. The MSI-SR1 allows the one- or twochannel connection of safety related signal sources such safety interlocking devices, position switches or safety light grids.

Advantages
•  Single-channel Emergency Stop wiring according to EN 954-1 Kat. 2
•  Monitoring of external relays in the push-button circuit
•  Automatic or manual start
•  3 switching off paths, 1 normal closed contact as signal circuit
•  Single channel safety door monitoring according to EN 954-1 Kat.2
•  Two channel safety light grid monitoring according to EN 954-1 Kat 3
•  Housing width: 22.5 mm

MSI-SR2, MSI-SR2/F Safety-Relays Category 4

The safety relay MSI-SR2 is an Emergency Stop switching device and safety door monitor in accordance with EN 60204-1, Stop 0 and EN 954-1, Cat. 4 for monitoring Emergency Stop push buttons or interlocking devices. The version MSI-SR2/F is equipped with a lower simultaneity monitoring of the input signals (20 ms) as well as a shorter pick-up delay (0,2 s) for use as an interface for optoelectronic protective devices.

Advantages
•  1- or 2-channel Emergency Stop wiring
•  2-channel wiring with cross circuit recognition
•  Monitoring of external relays in the push-button circuit
•  Monitored start button
•  Automatic or manual start (1,5 s delay)
•  2 switching off paths, 1 normal closed contact as signal circuit
•  LED displays for Power, K1 and K2
•  Housing width: 22.5 mm

MSI-SR3 Safety-Relays Category 4

The safety relay MSI-SR3 is an Emergency Stop switching device and safety door monitor intended to protect people from dangerous production processes in accordance with EN 60204-1 Stop-0 and EN 954-1, Cat. 4. The MSI-SR3 is particularly suited for use as a control unit and interface for connecting four-wire or two-wire safety mats/switching strips.

Advantages
•  2-channel Emergency Stop wiring with cross circuit recognition
•  Monitored start button
•  Manual or automatic start (1.5 s delay)
•  2 switching off paths, 1 normally closed contact as signal circuit
•  Monitoring of four-wire safety mats (with potential-free normally open contacts)
•  Monitoring of two-wire safety mats/switching strips (with potential-free normally open contacts)
•  Housing width: 22.5 mm

MSI-2H Safety-Relays Category 4

The safety relay MSI-2H is a two-hand relay in accordance with EN 574, Type III C, EN 954-1, Cat. 4, and a safety door monitor in accordance with EN 60204-1 Stop-0.

Advantages
•  Two-channel control with cross circuit monitoring
•  Simultaneity monitoring of 0.5 s
•  Monitoring of external relays in the feedback loop
•  2 switching off paths, 1 normally closed contact as signal circuit
•  LED indicators for Power, K1 and K2
•  Housing width: 22.5 mm
•  Two-hand operated relay in accordance with EN 574, Type III C

MSI-AC230/-AC115 Power supply units

The power supply units MSI-AC230 and MSI-AC115 are 24-V-power supplies for the MSI family or modular safety interfaces and the sensors attached to them. They are equipped with safe mains separation and can bridge short-term mains failures of up to 20 ms.

Advantages
•  230 and/or 115 V power supply
•  24 VDC, 0,8 A max
•  can be connected in parallel
•  Primary/secondary isolation 4 KV
•  Electromagnetic compability in accordance with EN 50082-2 and EN 55001 Class A
•  Housing width 35 mm

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To contact Zone Safety Systems about Safety Relays use Get a quote.